Release v0.1.6

README.md

@@ -3,6 +3,7 @@
 [![Build Status](https://github.com/alexforencich/cocotbext-axi/workflows/Regression%20Tests/badge.svg?branch=master)](https://github.com/alexforencich/cocotbext-axi/actions/)
 [![codecov](https://codecov.io/gh/alexforencich/cocotbext-axi/branch/master/graph/badge.svg)](https://codecov.io/gh/alexforencich/cocotbext-axi)
 [![PyPI version](https://badge.fury.io/py/cocotbext-axi.svg)](https://pypi.org/project/cocotbext-axi)
+[![Downloads](https://pepy.tech/badge/cocotbext-axi)](https://pepy.tech/project/cocotbext-axi)
 
 GitHub repository: https://github.com/alexforencich/cocotbext-axi
 
@@ -37,11 +38,11 @@ The `AxiMaster` is a wrapper around `AxiMasterWrite` and `AxiMasterRead`.  Simil
 
 To use these modules, import the one you need and connect it to the DUT:
 
-    from cocotbext.axi import AxiMaster
+    from cocotbext.axi import AxiBus, AxiMaster
 
-    axi_master = AxiMaster(dut, "s_axi", dut.clk, dut.rst)
+    axi_master = AxiMaster(AxiBus.from_prefix(dut, "s_axi"), dut.clk, dut.rst)
 
-The modules use `cocotb.bus.Bus` internally to automatically connect to the corresponding signals in the bus, presuming they are named according to the AXI spec and have a common prefix.
+The first argument to the constructor accepts an `AxiBus` or `AxiLiteBus` object.  These objects are containers for the interface signals and include class methods to automate connections.
 
 Once the module is instantiated, read and write operations can be initiated in a few different ways.
 
@@ -74,10 +75,10 @@ Second, blocking operations can be carried out with `read()` and `write()` and t
 
 #### `AxiMaster` and `AxiLiteMaster` constructor parameters
 
-* _entity_: object that contains the AXI slave interface signals
-* _name_: signal name prefix (e.g. for `s_axi_awaddr`, the prefix is `s_axi`)
+* _bus_: `AxiBus` or `AxiLiteBus` object containing AXI interface signals
 * _clock_: clock signal
 * _reset_: reset signal (optional)
+* _reset_active_level_: reset active level (optional, default `True`)
 
 #### Additional parameters for `AxiMaster`
 
@@ -131,6 +132,10 @@ Second, blocking operations can be carried out with `read()` and `write()` and t
 * _prot_: AXI protection flags, default `AxiProt.NONSECURE`
 * _event_: `Event` object used to wait on and retrieve result for specific operation, default `None` (`init_read()` and `init_write()` only).  If provided, the event will be triggered when the operation completes and the result returned via `Event.data` instead of `get_read_data()` or `get_write_resp()`.
 
+#### `AxiBus` and `AxiLiteBus` objects
+
+The `AxiBus`, `AxiLiteBus`, and related objects are containers for the interface signals.  These hold instances of bus objects for the individual channels, which are extensions of `cocotb.bus.Bus`.  Class methods `from_entity` and `from_prefix` are provided to facilitate signal name matching.  For AXI interfaces use `AxiBus`, `AxiReadBus`, or `AxiWriteBus`, as appropriate.  For AXI lite interfaces, use `AxiLiteBus`, `AxiLiteReadBus`, or `AxiLiteWriteBus`, as appropriate.
+
 ### AXI and AXI lite RAM
 
 The `AxiRam` and `AxiLiteRam` classes implement AXI RAMs and are capable of completing read and write operations from upstream AXI masters.  The `AxiRam` module is capable of handling narrow bursts.
@@ -139,11 +144,11 @@ The `AxiRam` is a wrapper around `AxiRamWrite` and `AxiRamRead`.  Similarly, `Ax
 
 To use these modules, import the one you need and connect it to the DUT:
 
-    from cocotbext.axi import AxiRam
+    from cocotbext.axi import AxiBus, AxiRam
 
-    axi_ram = AxiRam(dut, "m_axi", dut.clk, dut.rst, size=2**16)
+    axi_ram = AxiRam(AxiBus.from_prefix(dut, "m_axi"), dut.clk, dut.rst, size=2**16)
 
-The modules use `cocotb.bus.Bus` internally to automatically connect to the corresponding signals in the bus, presuming they are named according to the AXI spec and have a common prefix.
+The first argument to the constructor accepts an `AxiBus` or `AxiLiteBus` object.  These objects are containers for the interface signals and include class methods to automate connections.
 
 Once the module is instantiated, the memory contents can be accessed in a couple of different ways.  First, the `mmap` object can be accessed directly via the `mem` attribute.  Second, `read()`, `write()`, and various word-access wrappers are available.  Hex dump helper methods are also provided for debugging.  For example:
 
@@ -152,17 +157,17 @@ Once the module is instantiated, the memory contents can be accessed in a couple
 
 Multi-port memories can be constructed by passing the `mem` object of the first instance to the other instances.  For example, here is how to create a four-port RAM:
 
-    axi_ram_p1 = AxiRam(dut, "m00_axi", dut.clk, dut.rst, size=2**16)
-    axi_ram_p2 = AxiRam(dut, "m01_axi", dut.clk, dut.rst, mem=axi_ram_p1.mem)
-    axi_ram_p3 = AxiRam(dut, "m02_axi", dut.clk, dut.rst, mem=axi_ram_p1.mem)
-    axi_ram_p4 = AxiRam(dut, "m03_axi", dut.clk, dut.rst, mem=axi_ram_p1.mem)
+    axi_ram_p1 = AxiRam(AxiBus.from_prefix(dut, "m00_axi"), dut.clk, dut.rst, size=2**16)
+    axi_ram_p2 = AxiRam(AxiBus.from_prefix(dut, "m01_axi"), dut.clk, dut.rst, mem=axi_ram_p1.mem)
+    axi_ram_p3 = AxiRam(AxiBus.from_prefix(dut, "m02_axi"), dut.clk, dut.rst, mem=axi_ram_p1.mem)
+    axi_ram_p4 = AxiRam(AxiBus.from_prefix(dut, "m03_axi"), dut.clk, dut.rst, mem=axi_ram_p1.mem)
 
 #### `AxiRam` and `AxiLiteRam` constructor parameters
 
-* _entity_: object that contains the AXI master interface signals
-* _name_: signal name prefix (e.g. for `m_axi_awaddr`, the prefix is `m_axi`)
+* _bus_: `AxiBus` or `AxiLiteBus` object containing AXI interface signals
 * _clock_: clock signal
 * _reset_: reset signal (optional)
+* _reset_active_level_: reset active level (optional, default `True`)
 * _size_: memory size in bytes (optional, default 1024)
 * _mem_: mmap object to use (optional, overrides _size_)
 
@@ -188,33 +193,40 @@ Multi-port memories can be constructed by passing the `mem` object of the first
 * `write_word(address, data, byteorder='little', ws=2)`: write single _ws_-byte word at _address_
 * `write_dword(address, data, byteorder='little')`: write single 4-byte dword at _address_
 * `write_qword(address, data, byteorder='little')`: write single 8-byte qword at _address_
-* `hexdump(address, length, prefix='')`: print hex dump of _length_ bytes starting from `address`, prefix lines with optional `prefix`
-* `hexdump_line(address, length, prefix='')`: return hex dump (list of str) of _length_ bytes starting from `address`, prefix lines with optional `prefix`
-* `hexdump_str(address, length, prefix='')`: return hex dump (str) of _length_ bytes starting from `address`, prefix lines with optional `prefix`
+* `hexdump(address, length, prefix='')`: print hex dump of _length_ bytes starting from _address_, prefix lines with optional _prefix_
+* `hexdump_line(address, length, prefix='')`: return hex dump (list of str) of _length_ bytes starting from _address_, prefix lines with optional _prefix_
+* `hexdump_str(address, length, prefix='')`: return hex dump (str) of _length_ bytes starting from _address_, prefix lines with optional _prefix_
 
 ### AXI stream
 
-The `AxiStreamSource`, `AxiStreamSink`, and `AxiStreamMonitor` classes can be used to drive, receive, and monitor traffic on AXI stream interfaces.  The `AxiStreamSource` drives all signals except for `tready` and can be used to drive AXI stream traffic into a design.  The `AxiStreamSink` drives the `tready` line only and as such can receive AXI stream traffic and exert backpressure.  The `AxiStreamMonitor` drives no signals and as such can be connected to internal AXI stream interfaces to monitor traffic.
+The `AxiStreamSource`, `AxiStreamSink`, and `AxiStreamMonitor` classes can be used to drive, receive, and monitor traffic on AXI stream interfaces.  The `AxiStreamSource` drives all signals except for `tready` and can be used to drive AXI stream traffic into a design.  The `AxiStreamSink` drives the `tready` line only and as such can receive AXI stream traffic and exert backpressure.  The `AxiStreamMonitor` drives no signals and as such can be connected to AXI stream interfaces anywhere within a design to passively monitor traffic.
 
 To use these modules, import the one you need and connect it to the DUT:
 
-    from cocotbext.axi import AxiStreamSource, AxiStreamSink, AxiStreamMonitor
+    from cocotbext.axi import (AxiStreamBus, AxiStreamSource, AxiStreamSink, AxiStreamMonitor)
 
-    axis_source = AxiStreamSource(dut, "s_axis", dut.clk, dut.rst)
-    axis_sink = AxiStreamSink(dut, "m_axis", dut.clk, dut.rst)
-    axis_monitor = AxiStreamMonitor(dut.inst, "int_axis", dut.clk, dut.rst)
+    axis_source = AxiStreamSource(AxiStreamBus.from_prefix(dut, "s_axis"), dut.clk, dut.rst)
+    axis_sink = AxiStreamSink(AxiStreamBus.from_prefix(dut, "m_axis"), dut.clk, dut.rst)
+    axis_mon= AxiStreamMonitor(AxiStreamBus.from_prefix(dut.inst, "int_axis"), dut.clk, dut.rst)
 
-The modules use `cocotb.bus.Bus` internally to automatically connect to the corresponding signals in the bus, presuming they are named according to the AXI spec and have a common prefix.
+The first argument to the constructor accepts an `AxiStreamBus` object.  This object is a container for the interface signals and includes class methods to automate connections.
 
-To send data into a design with an `AxiStreamSource`, call `send()` or `write()`.  Accepted data types are iterables or `AxiStreamFrame` objects.  Call `wait()` to wait for the transmit operation to complete.  Example:
+To send data into a design with an `AxiStreamSource`, call `send()`/`send_nowait()` or `write()`/`write_nowait()`.  Accepted data types are iterables or `AxiStreamFrame` objects.  Optionally, call `wait()` to wait for the transmit operation to complete.  Example:
 
-    axis_source.send(b'test data')
+    await axis_source.send(b'test data')
+    # wait for operation to complete (optional)
     await axis_source.wait()
 
-To receive data with an `AxiStreamSink` or `AxiStreamMonitor`, call `recv()` or `read()`.  `recv()` is intended for use with a frame-oriented interface, and by default compacts `AxiStreamFrame`s before returning them.  `read()` is intended for non-frame-oriented streams.  Calling `read()` internally calls `recv()` for all frames currently in the queue, then compacts and coalesces `tdata` from all frames into a separate read queue, from which read data is returned.  All sideband data is discarded.  Call `wait()` to wait for new receive data.
+It is also possible to wait for the transmission of a specific frame to complete by passing an event in the tx_complete field of the `AxiStreamFrame` object, and then awaiting the event.  The frame, with simulation time fields set, will be returned in the event data.  Example:
 
-    await axis_sink.wait()
-    data = axis_sink.recv()
+    frame = AxiStreamFrame(b'test data', tx_complete=Event())
+    await axis_source.send(frame)
+    await frame.tx_complete.wait()
+    print(frame.tx_complete.data.sim_time_start)
+
+To receive data with an `AxiStreamSink` or `AxiStreamMonitor`, call `recv()`/`recv_nowait()` or `read()`/`read_nowait()`.  Optionally call `wait()` to wait for new receive data.  `recv()` is intended for use with a frame-oriented interface, and by default compacts `AxiStreamFrame`s before returning them.  `read()` is intended for non-frame-oriented streams.  Calling `read()` internally calls `recv()` for all frames currently in the queue, then compacts and coalesces `tdata` from all frames into a separate read queue, from which read data is returned.  All sideband data is discarded.
+
+    data = await axis_sink.recv()
 
 #### Signals
 
@@ -229,10 +241,10 @@ To receive data with an `AxiStreamSink` or `AxiStreamMonitor`, call `recv()` or
 
 #### Constructor parameters:
 
-* _entity_: object that contains the AXI stream interface signals
-* _name_: signal name prefix (e.g. for `m_axis_tdata`, the prefix is `m_axis`)
+* _bus_: `AxiStreamBus` object containing AXI stream interface signals
 * _clock_: clock signal
 * _reset_: reset signal (optional)
+* _reset_active_level_: reset active level (optional, default `True`)
 * _byte_size_: byte size (optional)
 * _byte_lanes_: byte lane count (optional)
 
@@ -256,17 +268,21 @@ Note: _byte_size_, _byte_lanes_, `len(tdata)`, and `len(tkeep)` are all related,
 * `recv_nowait(compact=True)`: receive a frame as a `GmiiFrame` (non-blocking) (sink)
 * `read(count)`: read _count_ bytes from buffer (blocking) (sink/monitor)
 * `read_nowait(count)`: read _count_ bytes from buffer (non-blocking) (sink/monitor)
-* `read(count)`: read _count_ bytes from buffer (sink/monitor)
 * `count()`: returns the number of items in the queue (all)
 * `empty()`: returns _True_ if the queue is empty (all)
 * `full()`: returns _True_ if the queue occupancy limits are met (sink)
 * `idle()`: returns _True_ if no transfer is in progress (all) or if the queue is not empty (source)
+* `clear()`: drop all data in queue (all)
 * `wait()`: wait for idle (source)
 * `wait(timeout=0, timeout_unit='ns')`: wait for frame received (sink)
 * `set_pause_generator(generator)`: set generator for pause signal, generator will be advanced on every clock cycle (source/sink)
 * `clear_pause_generator()`: remove generator for pause signal (source/sink)
 
-#### AxiStreamFrame object
+#### `AxiStreamBus` object
+
+The `AxiStreamBus` object is a container for the interface signals.  Currently, it is an extension of `cocotb.bus.Bus`.  Class methods `from_entity` and `from_prefix` are provided to facilitate signal name matching.
+
+#### `AxiStreamFrame` object
 
 The `AxiStreamFrame` object is a container for a frame to be transferred via AXI stream.  The `tdata` field contains the packet data in the form of a list of bytes, which is either a `bytearray` if the byte size is 8 bits or a `list` of `int`s otherwise.  `tkeep`, `tid`, `tdest`, and `tuser` can either be `None`, an `int`, or a `list` of `int`s.
 
@@ -277,6 +293,9 @@ Attributes:
 * `tid`: tid field, optional; int or list with one entry per `tdata`, last value used per cycle when sending.
 * `tdest`: tdest field, optional; int or list with one entry per `tdata`, last value used per cycle when sending.
 * `tuser`: tuser field, optional; int or list with one entry per `tdata`, last value used per cycle when sending.
+* `sim_time_start`: simulation time of first transfer cycle of frame.
+* `sim_time_end`: simulation time of last transfer cycle of frame.
+* `tx_complete`: event or callable triggered when frame is transmitted.
 
 Methods:
 

cocotbext/axi/__init__.py

@@ -26,10 +26,14 @@ from .version import __version__
 
 from .constants import AxiBurstType, AxiBurstSize, AxiLockType, AxiCacheBit, AxiProt, AxiResp
 
-from .axis import AxiStreamFrame, AxiStreamSource, AxiStreamSink, AxiStreamMonitor
+from .axis import AxiStreamFrame, AxiStreamBus, AxiStreamSource, AxiStreamSink, AxiStreamMonitor
 
+from .axil_channels import AxiLiteAWBus, AxiLiteWBus, AxiLiteBBus, AxiLiteARBus, AxiLiteRBus
+from .axil_channels import AxiLiteWriteBus, AxiLiteReadBus, AxiLiteBus
 from .axil_master import AxiLiteMasterWrite, AxiLiteMasterRead, AxiLiteMaster
 from .axil_ram import AxiLiteRamWrite, AxiLiteRamRead, AxiLiteRam
 
+from .axi_channels import AxiAWBus, AxiWBus, AxiBBus, AxiARBus, AxiRBus
+from .axi_channels import AxiWriteBus, AxiReadBus, AxiBus
 from .axi_master import AxiMasterWrite, AxiMasterRead, AxiMaster
 from .axi_ram import AxiRamWrite, AxiRamRead, AxiRam

cocotbext/axi/axi_channels.py

@@ -25,7 +25,7 @@ THE SOFTWARE.
 from .stream import define_stream
 
 # Write address channel
-AxiAWTransaction, AxiAWSource, AxiAWSink, AxiAWMonitor = define_stream("AxiAW",
+AxiAWBus, AxiAWTransaction, AxiAWSource, AxiAWSink, AxiAWMonitor = define_stream("AxiAW",
     signals=["awid", "awaddr", "awlen", "awsize", "awburst", "awprot", "awvalid", "awready"],
     optional_signals=["awlock", "awcache", "awqos", "awregion", "awuser"],
     signal_widths={"awlen": 8, "awsize": 3, "awburst": 2, "awlock": 1,
@@ -33,21 +33,21 @@ AxiAWTransaction, AxiAWSource, AxiAWSink, AxiAWMonitor = define_stream("AxiAW",
 )
 
 # Write data channel
-AxiWTransaction, AxiWSource, AxiWSink, AxiWMonitor = define_stream("AxiW",
+AxiWBus, AxiWTransaction, AxiWSource, AxiWSink, AxiWMonitor = define_stream("AxiW",
     signals=["wdata", "wstrb", "wlast", "wvalid", "wready"],
     optional_signals=["wuser"],
     signal_widths={"wlast": 1}
 )
 
 # Write response channel
-AxiBTransaction, AxiBSource, AxiBSink, AxiBMonitor = define_stream("AxiB",
+AxiBBus, AxiBTransaction, AxiBSource, AxiBSink, AxiBMonitor = define_stream("AxiB",
     signals=["bid", "bresp", "bvalid", "bready"],
     optional_signals=["buser"],
     signal_widths={"bresp": 2}
 )
 
 # Read address channel
-AxiARTransaction, AxiARSource, AxiARSink, AxiARMonitor = define_stream("AxiAR",
+AxiARBus, AxiARTransaction, AxiARSource, AxiARSink, AxiARMonitor = define_stream("AxiAR",
     signals=["arid", "araddr", "arlen", "arsize", "arburst", "arprot", "arvalid", "arready"],
     optional_signals=["arlock", "arcache", "arqos", "arregion", "aruser"],
     signal_widths={"arlen": 8, "arsize": 3, "arburst": 2, "arlock": 1,
@@ -55,8 +55,79 @@ AxiARTransaction, AxiARSource, AxiARSink, AxiARMonitor = define_stream("AxiAR",
 )
 
 # Read data channel
-AxiRTransaction, AxiRSource, AxiRSink, AxiRMonitor = define_stream("AxiR",
+AxiRBus, AxiRTransaction, AxiRSource, AxiRSink, AxiRMonitor = define_stream("AxiR",
     signals=["rid", "rdata", "rresp", "rlast", "rvalid", "rready"],
     optional_signals=["ruser"],
     signal_widths={"rresp": 2, "rlast": 1}
 )
+
+
+class AxiWriteBus:
+    def __init__(self, aw=None, w=None, b=None):
+        self.aw = aw
+        self.w = w
+        self.b = b
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        aw = AxiAWBus.from_entity(entity, **kwargs)
+        w = AxiWBus.from_entity(entity, **kwargs)
+        b = AxiBBus.from_entity(entity, **kwargs)
+        return cls(aw, w, b)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        aw = AxiAWBus.from_prefix(entity, prefix, **kwargs)
+        w = AxiWBus.from_prefix(entity, prefix, **kwargs)
+        b = AxiBBus.from_prefix(entity, prefix, **kwargs)
+        return cls(aw, w, b)
+
+    @classmethod
+    def from_channels(cls, aw, w, b):
+        return cls(aw, w, b)
+
+
+class AxiReadBus:
+    def __init__(self, ar=None, r=None):
+        self.ar = ar
+        self.r = r
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        ar = AxiARBus.from_entity(entity, **kwargs)
+        r = AxiRBus.from_entity(entity, **kwargs)
+        return cls(ar, r)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        ar = AxiARBus.from_prefix(entity, prefix, **kwargs)
+        r = AxiRBus.from_prefix(entity, prefix, **kwargs)
+        return cls(ar, r)
+
+    @classmethod
+    def from_channels(cls, ar, r):
+        return cls(ar, r)
+
+
+class AxiBus:
+    def __init__(self, write=None, read=None, **kwargs):
+        self.write = write
+        self.read = read
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        write = AxiWriteBus.from_entity(entity, **kwargs)
+        read = AxiReadBus.from_entity(entity, **kwargs)
+        return cls(write, read)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        write = AxiWriteBus.from_prefix(entity, prefix, **kwargs)
+        read = AxiReadBus.from_prefix(entity, prefix, **kwargs)
+        return cls(write, read)
+
+    @classmethod
+    def from_channels(cls, aw, w, b, ar, r):
+        write = AxiWriteBus.from_channels(aw, w, b)
+        read = AxiReadBus.from_channels(ar, r)
+        return cls(write, read)

cocotbext/axi/axi_master.py

@@ -31,6 +31,7 @@ from cocotb.triggers import Event
 from .version import __version__
 from .constants import AxiBurstType, AxiLockType, AxiProt, AxiResp
 from .axi_channels import AxiAWSource, AxiWSource, AxiBSink, AxiARSource, AxiRSink
+from .reset import Reset
 
 # AXI master write helper objects
 AxiWriteCmd = namedtuple("AxiWriteCmd", ["address", "data", "awid", "burst", "size",
@@ -47,26 +48,23 @@ AxiReadRespCmd = namedtuple("AxiReadRespCmd", ["address", "length", "size", "cyc
 AxiReadResp = namedtuple("AxiReadResp", ["address", "data", "resp", "user"])
 
 
-class AxiMasterWrite(object):
-    def __init__(self, entity, name, clock, reset=None, max_burst_len=256):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+class AxiMasterWrite(Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, max_burst_len=256):
+        self.log = logging.getLogger(f"cocotb.{bus.aw._entity._name}.{bus.aw._name}")
 
         self.log.info("AXI master (write)")
         self.log.info("cocotbext-axi version %s", __version__)
         self.log.info("Copyright (c) 2020 Alex Forencich")
         self.log.info("https://github.com/alexforencich/cocotbext-axi")
 
-        self.reset = reset
-
-        self.aw_channel = AxiAWSource(entity, name, clock, reset)
-        self.w_channel = AxiWSource(entity, name, clock, reset)
-        self.b_channel = AxiBSink(entity, name, clock, reset)
+        self.aw_channel = AxiAWSource(bus.aw, clock, reset, reset_active_level)
+        self.w_channel = AxiWSource(bus.w, clock, reset, reset_active_level)
+        self.b_channel = AxiBSink(bus.b, clock, reset, reset_active_level)
 
         self.write_command_queue = deque()
         self.write_command_sync = Event()
         self.write_resp_queue = deque()
         self.write_resp_sync = Event()
-        self.write_resp_set = set()
 
         self.id_count = 2**len(self.aw_channel.bus.awid)
         self.cur_id = 0
@@ -77,6 +75,8 @@ class AxiMasterWrite(object):
         self.int_write_resp_queue_list = [deque() for k in range(self.id_count)]
 
         self.in_flight_operations = 0
+        self._idle = Event()
+        self._idle.set()
 
         self.width = len(self.w_channel.bus.wdata)
         self.byte_size = 8
@@ -100,8 +100,10 @@ class AxiMasterWrite(object):
 
         assert len(self.b_channel.bus.bid) == len(self.aw_channel.bus.awid)
 
-        cocotb.fork(self._process_write())
-        cocotb.fork(self._process_write_resp())
+        self._process_write_cr = None
+        self._process_write_resp_cr = None
+
+        self._init_reset(reset, reset_active_level)
 
     def init_write(self, address, data, awid=None, burst=AxiBurstType.INCR, size=None, lock=AxiLockType.NORMAL,
             cache=0b0011, prot=AxiProt.NONSECURE, qos=0, region=0, user=0, wuser=0, event=None):
@@ -132,6 +134,7 @@ class AxiMasterWrite(object):
             wuser = list(wuser)
 
         self.in_flight_operations += 1
+        self._idle.clear()
 
         cmd = AxiWriteCmd(address, bytearray(data), awid, burst, size, lock,
             cache, prot, qos, region, user, wuser, event)
@@ -143,8 +146,7 @@ class AxiMasterWrite(object):
 
     async def wait(self):
         while not self.idle():
-            self.write_resp_sync.clear()
-            await self.write_resp_sync.wait()
+            await self._idle.wait()
 
     def write_resp_ready(self):
         return bool(self.write_resp_queue)
@@ -198,6 +200,41 @@ class AxiMasterWrite(object):
         await self.write_qwords(address, [data], byteorder, awid, burst, size,
             lock, cache, prot, qos, region, user, wuser)
 
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_write_cr is not None:
+                self._process_write_cr.kill()
+                self._process_write_cr = None
+            if self._process_write_resp_cr is not None:
+                self._process_write_resp_cr.kill()
+                self._process_write_resp_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_write_cr is None:
+                self._process_write_cr = cocotb.fork(self._process_write())
+            if self._process_write_resp_cr is None:
+                self._process_write_resp_cr = cocotb.fork(self._process_write_resp())
+
+        self.aw_channel.clear()
+        self.w_channel.clear()
+        self.b_channel.clear()
+
+        while self.write_command_queue:
+            cmd = self.write_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        while self.int_write_resp_command_queue:
+            cmd = self.int_write_resp_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        self.write_resp_queue.clear()
+
+        self.in_flight_operations = 0
+        self._idle.set()
+
     async def _process_write(self):
         while True:
             if not self.write_command_queue:
@@ -277,7 +314,7 @@ class AxiMasterWrite(object):
                     aw.awuser = cmd.user
 
                     self.active_id[awid] += 1
-                    await self.aw_channel.drive(aw)
+                    await self.aw_channel.send(aw)
 
                     self.log.info("Write burst start awid: 0x%x awaddr: 0x%08x awlen: %d awsize: %d awprot: %s",
                         awid, cur_addr, burst_length-1, cmd.size, cmd.prot)
@@ -360,26 +397,26 @@ class AxiMasterWrite(object):
 
             self.in_flight_operations -= 1
 
+            if self.in_flight_operations == 0:
+                self._idle.set()
 
-class AxiMasterRead(object):
-    def __init__(self, entity, name, clock, reset=None, max_burst_len=256):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+
+class AxiMasterRead(Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, max_burst_len=256):
+        self.log = logging.getLogger(f"cocotb.{bus.ar._entity._name}.{bus.ar._name}")
 
         self.log.info("AXI master (read)")
         self.log.info("cocotbext-axi version %s", __version__)
         self.log.info("Copyright (c) 2020 Alex Forencich")
         self.log.info("https://github.com/alexforencich/cocotbext-axi")
 
-        self.reset = reset
-
-        self.ar_channel = AxiARSource(entity, name, clock, reset)
-        self.r_channel = AxiRSink(entity, name, clock, reset)
+        self.ar_channel = AxiARSource(bus.ar, clock, reset, reset_active_level)
+        self.r_channel = AxiRSink(bus.r, clock, reset, reset_active_level)
 
         self.read_command_queue = deque()
         self.read_command_sync = Event()
         self.read_data_queue = deque()
         self.read_data_sync = Event()
-        self.read_data_set = set()
 
         self.id_count = 2**len(self.ar_channel.bus.arid)
         self.cur_id = 0
@@ -390,6 +427,8 @@ class AxiMasterRead(object):
         self.int_read_resp_queue_list = [deque() for k in range(self.id_count)]
 
         self.in_flight_operations = 0
+        self._idle = Event()
+        self._idle.set()
 
         self.width = len(self.r_channel.bus.rdata)
         self.byte_size = 8
@@ -411,8 +450,10 @@ class AxiMasterRead(object):
 
         assert len(self.r_channel.bus.rid) == len(self.ar_channel.bus.arid)
 
-        cocotb.fork(self._process_read())
-        cocotb.fork(self._process_read_resp())
+        self._process_read_cr = None
+        self._process_read_resp_cr = None
+
+        self._init_reset(reset, reset_active_level)
 
     def init_read(self, address, length, arid=None, burst=AxiBurstType.INCR, size=None,
             lock=AxiLockType.NORMAL, cache=0b0011, prot=AxiProt.NONSECURE, qos=0, region=0, user=0, event=None):
@@ -439,6 +480,7 @@ class AxiMasterRead(object):
         prot = AxiProt(prot)
 
         self.in_flight_operations += 1
+        self._idle.clear()
 
         cmd = AxiReadCmd(address, length, arid, burst, size, lock, cache, prot, qos, region, user, event)
         self.read_command_queue.append(cmd)
@@ -449,8 +491,7 @@ class AxiMasterRead(object):
 
     async def wait(self):
         while not self.idle():
-            self.read_data_sync.clear()
-            await self.read_data_sync.wait()
+            await self._idle.wait()
 
     def read_data_ready(self):
         return bool(self.read_data_queue)
@@ -504,6 +545,40 @@ class AxiMasterRead(object):
         return (await self.read_qwords(address, 1, byteorder, arid, burst, size,
             lock, cache, prot, qos, region, user))[0]
 
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_read_cr is not None:
+                self._process_read_cr.kill()
+                self._process_read_cr = None
+            if self._process_read_resp_cr is not None:
+                self._process_read_resp_cr.kill()
+                self._process_read_resp_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_read_cr is None:
+                self._process_read_cr = cocotb.fork(self._process_read())
+            if self._process_read_resp_cr is None:
+                self._process_read_resp_cr = cocotb.fork(self._process_read_resp())
+
+        self.ar_channel.clear()
+        self.r_channel.clear()
+
+        while self.read_command_queue:
+            cmd = self.read_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        while self.int_read_resp_command_queue:
+            cmd = self.int_read_resp_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        self.read_data_queue.clear()
+
+        self.in_flight_operations = 0
+        self._idle.set()
+
     async def _process_read(self):
         while True:
             if not self.read_command_queue:
@@ -560,7 +635,7 @@ class AxiMasterRead(object):
                     ar.aruser = cmd.user
 
                     self.active_id[arid] += 1
-                    await self.ar_channel.drive(ar)
+                    await self.ar_channel.send(ar)
 
                     self.log.info("Read burst start arid: 0x%x araddr: 0x%08x arlen: %d arsize: %d arprot: %s",
                         arid, cur_addr, burst_length-1, cmd.size, cmd.prot)
@@ -657,14 +732,17 @@ class AxiMasterRead(object):
 
             self.in_flight_operations -= 1
 
+            if self.in_flight_operations == 0:
+                self._idle.set()
 
-class AxiMaster(object):
-    def __init__(self, entity, name, clock, reset=None, max_burst_len=256):
+
+class AxiMaster:
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, max_burst_len=256):
         self.write_if = None
         self.read_if = None
 
-        self.write_if = AxiMasterWrite(entity, name, clock, reset, max_burst_len)
-        self.read_if = AxiMasterRead(entity, name, clock, reset, max_burst_len)
+        self.write_if = AxiMasterWrite(bus.write, clock, reset, reset_active_level, max_burst_len)
+        self.read_if = AxiMasterRead(bus.read, clock, reset, reset_active_level, max_burst_len)
 
     def init_read(self, address, length, arid=None, burst=AxiBurstType.INCR, size=None,
             lock=AxiLockType.NORMAL, cache=0b0011, prot=AxiProt.NONSECURE, qos=0, region=0, user=0, event=None):

cocotbext/axi/axi_ram.py

@@ -30,11 +30,12 @@ from .version import __version__
 from .constants import AxiBurstType, AxiProt, AxiResp
 from .axi_channels import AxiAWSink, AxiWSink, AxiBSource, AxiARSink, AxiRSource
 from .memory import Memory
+from .reset import Reset
 
 
-class AxiRamWrite(Memory):
-    def __init__(self, entity, name, clock, reset=None, size=1024, mem=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+class AxiRamWrite(Memory, Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, size=1024, mem=None, *args, **kwargs):
+        self.log = logging.getLogger(f"cocotb.{bus.aw._entity._name}.{bus.aw._name}")
 
         self.log.info("AXI RAM model (write)")
         self.log.info("cocotbext-axi version %s", __version__)
@@ -43,13 +44,9 @@ class AxiRamWrite(Memory):
 
         super().__init__(size, mem, *args, **kwargs)
 
-        self.reset = reset
-
-        self.aw_channel = AxiAWSink(entity, name, clock, reset)
-        self.w_channel = AxiWSink(entity, name, clock, reset)
-        self.b_channel = AxiBSource(entity, name, clock, reset)
-
-        self.in_flight_operations = 0
+        self.aw_channel = AxiAWSink(bus.aw, clock, reset, reset_active_level)
+        self.w_channel = AxiWSink(bus.w, clock, reset, reset_active_level)
+        self.b_channel = AxiBSource(bus.b, clock, reset, reset_active_level)
 
         self.width = len(self.w_channel.bus.wdata)
         self.byte_size = 8
@@ -68,7 +65,24 @@ class AxiRamWrite(Memory):
 
         assert len(self.b_channel.bus.bid) == len(self.aw_channel.bus.awid)
 
-        cocotb.fork(self._process_write())
+        self._process_write_cr = None
+
+        self._init_reset(reset, reset_active_level)
+
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_write_cr is not None:
+                self._process_write_cr.kill()
+                self._process_write_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_write_cr is None:
+                self._process_write_cr = cocotb.fork(self._process_write())
+
+        self.aw_channel.clear()
+        self.w_channel.clear()
+        self.b_channel.clear()
 
     async def _process_write(self):
         while True:
@@ -142,9 +156,9 @@ class AxiRamWrite(Memory):
             await self.b_channel.send(b)
 
 
-class AxiRamRead(Memory):
-    def __init__(self, entity, name, clock, reset=None, size=1024, mem=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+class AxiRamRead(Memory, Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, size=1024, mem=None, *args, **kwargs):
+        self.log = logging.getLogger(f"cocotb.{bus.ar._entity._name}.{bus.ar._name}")
 
         self.log.info("AXI RAM model (read)")
         self.log.info("cocotbext-axi version %s", __version__)
@@ -153,12 +167,8 @@ class AxiRamRead(Memory):
 
         super().__init__(size, mem, *args, **kwargs)
 
-        self.reset = reset
-
-        self.ar_channel = AxiARSink(entity, name, clock, reset)
-        self.r_channel = AxiRSource(entity, name, clock, reset)
-
-        self.in_flight_operations = 0
+        self.ar_channel = AxiARSink(bus.ar, clock, reset, reset_active_level)
+        self.r_channel = AxiRSource(bus.r, clock, reset, reset_active_level)
 
         self.width = len(self.r_channel.bus.rdata)
         self.byte_size = 8
@@ -175,7 +185,23 @@ class AxiRamRead(Memory):
 
         assert len(self.r_channel.bus.rid) == len(self.ar_channel.bus.arid)
 
-        cocotb.fork(self._process_read())
+        self._process_read_cr = None
+
+        self._init_reset(reset, reset_active_level)
+
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_read_cr is not None:
+                self._process_read_cr.kill()
+                self._process_read_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_read_cr is None:
+                self._process_read_cr = cocotb.fork(self._process_read())
+
+        self.ar_channel.clear()
+        self.r_channel.clear()
 
     async def _process_read(self):
         while True:
@@ -236,11 +262,11 @@ class AxiRamRead(Memory):
 
 
 class AxiRam(Memory):
-    def __init__(self, entity, name, clock, reset=None, size=1024, mem=None, *args, **kwargs):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, size=1024, mem=None, *args, **kwargs):
         self.write_if = None
         self.read_if = None
 
         super().__init__(size, mem, *args, **kwargs)
 
-        self.write_if = AxiRamWrite(entity, name, clock, reset, mem=self.mem)
-        self.read_if = AxiRamRead(entity, name, clock, reset, mem=self.mem)
+        self.write_if = AxiRamWrite(bus.write, clock, reset, reset_active_level, mem=self.mem)
+        self.read_if = AxiRamRead(bus.read, clock, reset, reset_active_level, mem=self.mem)

cocotbext/axi/axil_channels.py

@@ -25,30 +25,101 @@ THE SOFTWARE.
 from .stream import define_stream
 
 # Write address channel
-AxiLiteAWTransaction, AxiLiteAWSource, AxiLiteAWSink, AxiLiteAWMonitor = define_stream("AxiLiteAW",
+AxiLiteAWBus, AxiLiteAWTransaction, AxiLiteAWSource, AxiLiteAWSink, AxiLiteAWMonitor = define_stream("AxiLiteAW",
     signals=["awaddr", "awprot", "awvalid", "awready"],
     signal_widths={"awprot": 3}
 )
 
 # Write data channel
-AxiLiteWTransaction, AxiLiteWSource, AxiLiteWSink, AxiLiteWMonitor = define_stream("AxiLiteW",
+AxiLiteWBus, AxiLiteWTransaction, AxiLiteWSource, AxiLiteWSink, AxiLiteWMonitor = define_stream("AxiLiteW",
     signals=["wdata", "wstrb", "wvalid", "wready"]
 )
 
 # Write response channel
-AxiLiteBTransaction, AxiLiteBSource, AxiLiteBSink, AxiLiteBMonitor = define_stream("AxiLiteB",
+AxiLiteBBus, AxiLiteBTransaction, AxiLiteBSource, AxiLiteBSink, AxiLiteBMonitor = define_stream("AxiLiteB",
     signals=["bresp", "bvalid", "bready"],
     signal_widths={"bresp": 2}
 )
 
 # Read address channel
-AxiLiteARTransaction, AxiLiteARSource, AxiLiteARSink, AxiLiteARMonitor = define_stream("AxiLiteAR",
+AxiLiteARBus, AxiLiteARTransaction, AxiLiteARSource, AxiLiteARSink, AxiLiteARMonitor = define_stream("AxiLiteAR",
     signals=["araddr", "arprot", "arvalid", "arready"],
     signal_widths={"arprot": 3}
 )
 
 # Read data channel
-AxiLiteRTransaction, AxiLiteRSource, AxiLiteRSink, AxiLiteRMonitor = define_stream("AxiLiteR",
+AxiLiteRBus, AxiLiteRTransaction, AxiLiteRSource, AxiLiteRSink, AxiLiteRMonitor = define_stream("AxiLiteR",
     signals=["rdata", "rresp", "rvalid", "rready"],
     signal_widths={"rresp": 2}
 )
+
+
+class AxiLiteWriteBus:
+    def __init__(self, aw=None, w=None, b=None):
+        self.aw = aw
+        self.w = w
+        self.b = b
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        aw = AxiLiteAWBus.from_entity(entity, **kwargs)
+        w = AxiLiteWBus.from_entity(entity, **kwargs)
+        b = AxiLiteBBus.from_entity(entity, **kwargs)
+        return cls(aw, w, b)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        aw = AxiLiteAWBus.from_prefix(entity, prefix, **kwargs)
+        w = AxiLiteWBus.from_prefix(entity, prefix, **kwargs)
+        b = AxiLiteBBus.from_prefix(entity, prefix, **kwargs)
+        return cls(aw, w, b)
+
+    @classmethod
+    def from_channels(cls, aw, w, b):
+        return cls(aw, w, b)
+
+
+class AxiLiteReadBus:
+    def __init__(self, ar=None, r=None):
+        self.ar = ar
+        self.r = r
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        ar = AxiLiteARBus.from_entity(entity, **kwargs)
+        r = AxiLiteRBus.from_entity(entity, **kwargs)
+        return cls(ar, r)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        ar = AxiLiteARBus.from_prefix(entity, prefix, **kwargs)
+        r = AxiLiteRBus.from_prefix(entity, prefix, **kwargs)
+        return cls(ar, r)
+
+    @classmethod
+    def from_channels(cls, ar, r):
+        return cls(ar, r)
+
+
+class AxiLiteBus:
+    def __init__(self, write=None, read=None, **kwargs):
+        self.write = write
+        self.read = read
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        write = AxiLiteWriteBus.from_entity(entity, **kwargs)
+        read = AxiLiteReadBus.from_entity(entity, **kwargs)
+        return cls(write, read)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        write = AxiLiteWriteBus.from_prefix(entity, prefix, **kwargs)
+        read = AxiLiteReadBus.from_prefix(entity, prefix, **kwargs)
+        return cls(write, read)
+
+    @classmethod
+    def from_channels(cls, aw, w, b, ar, r):
+        write = AxiLiteWriteBus.from_channels(aw, w, b)
+        read = AxiLiteReadBus.from_channels(ar, r)
+        return cls(write, read)

cocotbext/axi/axil_master.py

@@ -31,6 +31,7 @@ from cocotb.triggers import Event
 from .version import __version__
 from .constants import AxiProt, AxiResp
 from .axil_channels import AxiLiteAWSource, AxiLiteWSource, AxiLiteBSink, AxiLiteARSource, AxiLiteRSink
+from .reset import Reset
 
 # AXI lite master write
 AxiLiteWriteCmd = namedtuple("AxiLiteWriteCmd", ["address", "data", "prot", "event"])
@@ -43,31 +44,30 @@ AxiLiteReadRespCmd = namedtuple("AxiLiteReadRespCmd", ["address", "length", "cyc
 AxiLiteReadResp = namedtuple("AxiLiteReadResp", ["address", "data", "resp"])
 
 
-class AxiLiteMasterWrite(object):
-    def __init__(self, entity, name, clock, reset=None):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+class AxiLiteMasterWrite(Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True):
+        self.log = logging.getLogger(f"cocotb.{bus.aw._entity._name}.{bus.aw._name}")
 
         self.log.info("AXI lite master (write)")
         self.log.info("cocotbext-axi version %s", __version__)
         self.log.info("Copyright (c) 2020 Alex Forencich")
         self.log.info("https://github.com/alexforencich/cocotbext-axi")
 
-        self.reset = reset
-
-        self.aw_channel = AxiLiteAWSource(entity, name, clock, reset)
-        self.w_channel = AxiLiteWSource(entity, name, clock, reset)
-        self.b_channel = AxiLiteBSink(entity, name, clock, reset)
+        self.aw_channel = AxiLiteAWSource(bus.aw, clock, reset, reset_active_level)
+        self.w_channel = AxiLiteWSource(bus.w, clock, reset, reset_active_level)
+        self.b_channel = AxiLiteBSink(bus.b, clock, reset, reset_active_level)
 
         self.write_command_queue = deque()
         self.write_command_sync = Event()
         self.write_resp_queue = deque()
         self.write_resp_sync = Event()
-        self.write_resp_set = set()
 
         self.int_write_resp_command_queue = deque()
         self.int_write_resp_command_sync = Event()
 
         self.in_flight_operations = 0
+        self._idle = Event()
+        self._idle.set()
 
         self.width = len(self.w_channel.bus.wdata)
         self.byte_size = 8
@@ -82,14 +82,17 @@ class AxiLiteMasterWrite(object):
         assert self.byte_width == len(self.w_channel.bus.wstrb)
         assert self.byte_width * self.byte_size == self.width
 
-        cocotb.fork(self._process_write())
-        cocotb.fork(self._process_write_resp())
+        self._process_write_cr = None
+        self._process_write_resp_cr = None
+
+        self._init_reset(reset, reset_active_level)
 
     def init_write(self, address, data, prot=AxiProt.NONSECURE, event=None):
         if event is not None and not isinstance(event, Event):
             raise ValueError("Expected event object")
 
         self.in_flight_operations += 1
+        self._idle.clear()
 
         self.write_command_queue.append(AxiLiteWriteCmd(address, bytearray(data), prot, event))
         self.write_command_sync.set()
@@ -99,8 +102,7 @@ class AxiLiteMasterWrite(object):
 
     async def wait(self):
         while not self.idle():
-            self.write_resp_sync.clear()
-            await self.write_resp_sync.wait()
+            await self._idle.wait()
 
     def write_resp_ready(self):
         return bool(self.write_resp_queue)
@@ -141,6 +143,41 @@ class AxiLiteMasterWrite(object):
     async def write_qword(self, address, data, byteorder='little', prot=AxiProt.NONSECURE):
         await self.write_qwords(address, [data], byteorder, prot)
 
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_write_cr is not None:
+                self._process_write_cr.kill()
+                self._process_write_cr = None
+            if self._process_write_resp_cr is not None:
+                self._process_write_resp_cr.kill()
+                self._process_write_resp_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_write_cr is None:
+                self._process_write_cr = cocotb.fork(self._process_write())
+            if self._process_write_resp_cr is None:
+                self._process_write_resp_cr = cocotb.fork(self._process_write_resp())
+
+        self.aw_channel.clear()
+        self.w_channel.clear()
+        self.b_channel.clear()
+
+        while self.write_command_queue:
+            cmd = self.write_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        while self.int_write_resp_command_queue:
+            cmd = self.int_write_resp_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        self.write_resp_queue.clear()
+
+        self.in_flight_operations = 0
+        self._idle.set()
+
     async def _process_write(self):
         while True:
             if not self.write_command_queue:
@@ -193,7 +230,7 @@ class AxiLiteMasterWrite(object):
                 w.wdata = val
                 w.wstrb = strb
 
-                await self.aw_channel.drive(aw)
+                await self.aw_channel.send(aw)
                 await self.w_channel.send(w)
 
     async def _process_write_resp(self):
@@ -227,31 +264,33 @@ class AxiLiteMasterWrite(object):
 
             self.in_flight_operations -= 1
 
+            if self.in_flight_operations == 0:
+                self._idle.set()
 
-class AxiLiteMasterRead(object):
-    def __init__(self, entity, name, clock, reset=None):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+
+class AxiLiteMasterRead(Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True):
+        self.log = logging.getLogger(f"cocotb.{bus.ar._entity._name}.{bus.ar._name}")
 
         self.log.info("AXI lite master (read)")
         self.log.info("cocotbext-axi version %s", __version__)
         self.log.info("Copyright (c) 2020 Alex Forencich")
         self.log.info("https://github.com/alexforencich/cocotbext-axi")
 
-        self.reset = reset
-
-        self.ar_channel = AxiLiteARSource(entity, name, clock, reset)
-        self.r_channel = AxiLiteRSink(entity, name, clock, reset)
+        self.ar_channel = AxiLiteARSource(bus.ar, clock, reset, reset_active_level)
+        self.r_channel = AxiLiteRSink(bus.r, clock, reset, reset_active_level)
 
         self.read_command_queue = deque()
         self.read_command_sync = Event()
         self.read_data_queue = deque()
         self.read_data_sync = Event()
-        self.read_data_set = set()
 
         self.int_read_resp_command_queue = deque()
         self.int_read_resp_command_sync = Event()
 
         self.in_flight_operations = 0
+        self._idle = Event()
+        self._idle.set()
 
         self.width = len(self.r_channel.bus.rdata)
         self.byte_size = 8
@@ -264,14 +303,17 @@ class AxiLiteMasterRead(object):
 
         assert self.byte_width * self.byte_size == self.width
 
-        cocotb.fork(self._process_read())
-        cocotb.fork(self._process_read_resp())
+        self._process_read_cr = None
+        self._process_read_resp_cr = None
+
+        self._init_reset(reset, reset_active_level)
 
     def init_read(self, address, length, prot=AxiProt.NONSECURE, event=None):
         if event is not None and not isinstance(event, Event):
             raise ValueError("Expected event object")
 
         self.in_flight_operations += 1
+        self._idle.clear()
 
         self.read_command_queue.append(AxiLiteReadCmd(address, length, prot, event))
         self.read_command_sync.set()
@@ -281,8 +323,7 @@ class AxiLiteMasterRead(object):
 
     async def wait(self):
         while not self.idle():
-            self.read_data_sync.clear()
-            await self.read_data_sync.wait()
+            await self._idle.wait()
 
     def read_data_ready(self):
         return bool(self.read_data_queue)
@@ -323,6 +364,40 @@ class AxiLiteMasterRead(object):
     async def read_qword(self, address, byteorder='little', prot=AxiProt.NONSECURE):
         return (await self.read_qwords(address, 1, byteorder, prot))[0]
 
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_read_cr is not None:
+                self._process_read_cr.kill()
+                self._process_read_cr = None
+            if self._process_read_resp_cr is not None:
+                self._process_read_resp_cr.kill()
+                self._process_read_resp_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_read_cr is None:
+                self._process_read_cr = cocotb.fork(self._process_read())
+            if self._process_read_resp_cr is None:
+                self._process_read_resp_cr = cocotb.fork(self._process_read_resp())
+
+        self.ar_channel.clear()
+        self.r_channel.clear()
+
+        while self.read_command_queue:
+            cmd = self.read_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        while self.int_read_resp_command_queue:
+            cmd = self.int_read_resp_command_queue.popleft()
+            if cmd.event:
+                cmd.event.set(None)
+
+        self.read_data_queue.clear()
+
+        self.in_flight_operations = 0
+        self._idle.set()
+
     async def _process_read(self):
         while True:
             if not self.read_command_queue:
@@ -347,7 +422,7 @@ class AxiLiteMasterRead(object):
                 ar.araddr = word_addr + k*self.byte_width
                 ar.arprot = cmd.prot
 
-                await self.ar_channel.drive(ar)
+                await self.ar_channel.send(ar)
 
     async def _process_read_resp(self):
         while True:
@@ -397,14 +472,17 @@ class AxiLiteMasterRead(object):
 
             self.in_flight_operations -= 1
 
+            if self.in_flight_operations == 0:
+                self._idle.set()
 
-class AxiLiteMaster(object):
-    def __init__(self, entity, name, clock, reset=None):
+
+class AxiLiteMaster:
+    def __init__(self, bus, clock, reset=None, reset_active_level=True):
         self.write_if = None
         self.read_if = None
 
-        self.write_if = AxiLiteMasterWrite(entity, name, clock, reset)
-        self.read_if = AxiLiteMasterRead(entity, name, clock, reset)
+        self.write_if = AxiLiteMasterWrite(bus.write, clock, reset, reset_active_level)
+        self.read_if = AxiLiteMasterRead(bus.read, clock, reset, reset_active_level)
 
     def init_read(self, address, length, prot=AxiProt.NONSECURE, event=None):
         self.read_if.init_read(address, length, prot, event)

cocotbext/axi/axil_ram.py

@@ -30,11 +30,12 @@ from .version import __version__
 from .constants import AxiProt, AxiResp
 from .axil_channels import AxiLiteAWSink, AxiLiteWSink, AxiLiteBSource, AxiLiteARSink, AxiLiteRSource
 from .memory import Memory
+from .reset import Reset
 
 
-class AxiLiteRamWrite(Memory):
-    def __init__(self, entity, name, clock, reset=None, size=1024, mem=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+class AxiLiteRamWrite(Memory, Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, size=1024, mem=None, *args, **kwargs):
+        self.log = logging.getLogger(f"cocotb.{bus.aw._entity._name}.{bus.aw._name}")
 
         self.log.info("AXI lite RAM model (write)")
         self.log.info("cocotbext-axi version %s", __version__)
@@ -43,13 +44,9 @@ class AxiLiteRamWrite(Memory):
 
         super().__init__(size, mem, *args, **kwargs)
 
-        self.reset = reset
-
-        self.aw_channel = AxiLiteAWSink(entity, name, clock, reset)
-        self.w_channel = AxiLiteWSink(entity, name, clock, reset)
-        self.b_channel = AxiLiteBSource(entity, name, clock, reset)
-
-        self.in_flight_operations = 0
+        self.aw_channel = AxiLiteAWSink(bus.aw, clock, reset, reset_active_level)
+        self.w_channel = AxiLiteWSink(bus.w, clock, reset, reset_active_level)
+        self.b_channel = AxiLiteBSource(bus.b, clock, reset, reset_active_level)
 
         self.width = len(self.w_channel.bus.wdata)
         self.byte_size = 8
@@ -65,7 +62,24 @@ class AxiLiteRamWrite(Memory):
         assert self.byte_width == len(self.w_channel.bus.wstrb)
         assert self.byte_width * self.byte_size == self.width
 
-        cocotb.fork(self._process_write())
+        self._process_write_cr = None
+
+        self._init_reset(reset, reset_active_level)
+
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_write_cr is not None:
+                self._process_write_cr.kill()
+                self._process_write_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_write_cr is None:
+                self._process_write_cr = cocotb.fork(self._process_write())
+
+        self.aw_channel.clear()
+        self.w_channel.clear()
+        self.b_channel.clear()
 
     async def _process_write(self):
         while True:
@@ -100,9 +114,9 @@ class AxiLiteRamWrite(Memory):
             await self.b_channel.send(b)
 
 
-class AxiLiteRamRead(Memory):
-    def __init__(self, entity, name, clock, reset=None, size=1024, mem=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
+class AxiLiteRamRead(Memory, Reset):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, size=1024, mem=None, *args, **kwargs):
+        self.log = logging.getLogger(f"cocotb.{bus.ar._entity._name}.{bus.ar._name}")
 
         self.log.info("AXI lite RAM model (read)")
         self.log.info("cocotbext-axi version %s", __version__)
@@ -111,12 +125,8 @@ class AxiLiteRamRead(Memory):
 
         super().__init__(size, mem, *args, **kwargs)
 
-        self.reset = reset
-
-        self.ar_channel = AxiLiteARSink(entity, name, clock, reset)
-        self.r_channel = AxiLiteRSource(entity, name, clock, reset)
-
-        self.in_flight_operations = 0
+        self.ar_channel = AxiLiteARSink(bus.ar, clock, reset, reset_active_level)
+        self.r_channel = AxiLiteRSource(bus.r, clock, reset, reset_active_level)
 
         self.width = len(self.r_channel.bus.rdata)
         self.byte_size = 8
@@ -130,7 +140,23 @@ class AxiLiteRamRead(Memory):
 
         assert self.byte_width * self.byte_size == self.width
 
-        cocotb.fork(self._process_read())
+        self._process_read_cr = None
+
+        self._init_reset(reset, reset_active_level)
+
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._process_read_cr is not None:
+                self._process_read_cr.kill()
+                self._process_read_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._process_read_cr is None:
+                self._process_read_cr = cocotb.fork(self._process_read())
+
+        self.ar_channel.clear()
+        self.r_channel.clear()
 
     async def _process_read(self):
         while True:
@@ -156,11 +182,11 @@ class AxiLiteRamRead(Memory):
 
 
 class AxiLiteRam(Memory):
-    def __init__(self, entity, name, clock, reset=None, size=1024, mem=None, *args, **kwargs):
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, size=1024, mem=None, *args, **kwargs):
         self.write_if = None
         self.read_if = None
 
         super().__init__(size, mem, *args, **kwargs)
 
-        self.write_if = AxiLiteRamWrite(entity, name, clock, reset, mem=self.mem)
-        self.read_if = AxiLiteRamRead(entity, name, clock, reset, mem=self.mem)
+        self.write_if = AxiLiteRamWrite(bus.write, clock, reset, reset_active_level, mem=self.mem)
+        self.read_if = AxiLiteRamRead(bus.read, clock, reset, reset_active_level, mem=self.mem)

cocotbext/axi/axis.py

@@ -26,19 +26,24 @@ import logging
 from collections import deque
 
 import cocotb
-from cocotb.triggers import RisingEdge, ReadOnly, Timer, First, Event
+from cocotb.triggers import RisingEdge, Timer, First, Event
+from cocotb.utils import get_sim_time
 from cocotb.bus import Bus
 
 from .version import __version__
+from .reset import Reset
 
 
-class AxiStreamFrame(object):
-    def __init__(self, tdata=b'', tkeep=None, tid=None, tdest=None, tuser=None):
+class AxiStreamFrame:
+    def __init__(self, tdata=b'', tkeep=None, tid=None, tdest=None, tuser=None, tx_complete=None):
         self.tdata = bytearray()
         self.tkeep = None
         self.tid = None
         self.tdest = None
         self.tuser = None
+        self.sim_time_start = None
+        self.sim_time_end = None
+        self.tx_complete = None
 
         if type(tdata) is AxiStreamFrame:
             if type(tdata.tdata) is bytearray:
@@ -62,6 +67,9 @@ class AxiStreamFrame(object):
                     self.tuser = tdata.tuser
                 else:
                     self.tuser = list(tdata.tuser)
+            self.sim_time_start = tdata.sim_time_start
+            self.sim_time_end = tdata.sim_time_end
+            self.tx_complete = tdata.tx_complete
         elif type(tdata) in (bytes, bytearray):
             self.tdata = bytearray(tdata)
             self.tkeep = tkeep
@@ -75,6 +83,9 @@ class AxiStreamFrame(object):
             self.tdest = tdest
             self.tuser = tuser
 
+        if tx_complete is not None:
+            self.tx_complete = tx_complete
+
     def normalize(self):
         # normalize all sideband signals to the same size as tdata
         n = len(self.tdata)
@@ -144,6 +155,12 @@ class AxiStreamFrame(object):
         elif all(self.tuser[0] == i for i in self.tuser):
             self.tuser = self.tuser[0]
 
+    def handle_tx_complete(self):
+        if isinstance(self.tx_complete, Event):
+            self.tx_complete.set(self)
+        elif callable(self.tx_complete):
+            self.tx_complete(self)
+
     def __eq__(self, other):
         if not isinstance(other, AxiStreamFrame):
             return False
@@ -195,11 +212,13 @@ class AxiStreamFrame(object):
 
     def __repr__(self):
         return (
-            f"{type(self).__name__}(tdata={repr(self.tdata)}, "
-            f"tkeep={repr(self.tkeep)}, "
-            f"tid={repr(self.tid)}, "
-            f"tdest={repr(self.tdest)}, "
-            f"tuser={repr(self.tuser)})"
+            f"{type(self).__name__}(tdata={self.tdata!r}, "
+            f"tkeep={self.tkeep!r}, "
+            f"tid={self.tid!r}, "
+            f"tdest={self.tdest!r}, "
+            f"tuser={self.tuser!r}, "
+            f"sim_time_start={self.sim_time_start!r}, "
+            f"sim_time_end={self.sim_time_end!r})"
         )
 
     def __len__(self):
@@ -212,19 +231,44 @@ class AxiStreamFrame(object):
         return bytes(self.tdata)
 
 
-class AxiStreamSource(object):
+class AxiStreamBus(Bus):
 
     _signals = ["tdata"]
     _optional_signals = ["tvalid", "tready", "tlast", "tkeep", "tid", "tdest", "tuser"]
 
-    def __init__(self, entity, name, clock, reset=None, byte_size=None, byte_lanes=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
-        self.entity = entity
+    def __init__(self, entity=None, prefix=None, **kwargs):
+        super().__init__(entity, prefix, self._signals, optional_signals=self._optional_signals, **kwargs)
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        return cls(entity, **kwargs)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        return cls(entity, prefix, **kwargs)
+
+
+class AxiStreamBase(Reset):
+
+    _signals = ["tdata"]
+    _optional_signals = ["tvalid", "tready", "tlast", "tkeep", "tid", "tdest", "tuser"]
+
+    _type = "base"
+
+    _init_x = False
+
+    _valid_init = None
+    _ready_init = None
+
+    def __init__(self, bus, clock, reset=None, reset_active_level=True,
+            byte_size=None, byte_lanes=None, *args, **kwargs):
+
+        self.bus = bus
         self.clock = clock
         self.reset = reset
-        self.bus = Bus(self.entity, name, self._signals, optional_signals=self._optional_signals, **kwargs)
+        self.log = logging.getLogger(f"cocotb.{bus._entity._name}.{bus._name}")
 
-        self.log.info("AXI stream source")
+        self.log.info("AXI stream %s", self._type)
         self.log.info("cocotbext-axi version %s", __version__)
         self.log.info("Copyright (c) 2020 Alex Forencich")
         self.log.info("https://github.com/alexforencich/cocotbext-axi")
@@ -233,10 +277,7 @@ class AxiStreamSource(object):
 
         self.active = False
         self.queue = deque()
-
-        self.pause = False
-        self._pause_generator = None
-        self._pause_cr = None
+        self.queue_sync = Event()
 
         self.queue_occupancy_bytes = 0
         self.queue_occupancy_frames = 0
@@ -244,21 +285,17 @@ class AxiStreamSource(object):
         self.width = len(self.bus.tdata)
         self.byte_lanes = 1
 
-        self.reset = reset
+        if self._valid_init is not None and hasattr(self.bus, "tvalid"):
+            self.bus.tvalid.setimmediatevalue(self._valid_init)
+        if self._ready_init is not None and hasattr(self.bus, "tready"):
+            self.bus.tready.setimmediatevalue(self._ready_init)
 
-        self.bus.tdata.setimmediatevalue(0)
-        if hasattr(self.bus, "tvalid"):
-            self.bus.tvalid.setimmediatevalue(0)
-        if hasattr(self.bus, "tlast"):
-            self.bus.tlast.setimmediatevalue(0)
-        if hasattr(self.bus, "tkeep"):
-            self.bus.tkeep.setimmediatevalue(0)
-        if hasattr(self.bus, "tid"):
-            self.bus.tid.setimmediatevalue(0)
-        if hasattr(self.bus, "tdest"):
-            self.bus.tdest.setimmediatevalue(0)
-        if hasattr(self.bus, "tuser"):
-            self.bus.tuser.setimmediatevalue(0)
+        for sig in self._signals+self._optional_signals:
+            if hasattr(self.bus, sig):
+                if self._init_x and sig not in ("tvalid", "tready"):
+                    v = getattr(self.bus, sig).value
+                    v.binstr = 'x'*len(v)
+                    getattr(self.bus, sig).setimmediatevalue(v)
 
         if hasattr(self.bus, "tkeep"):
             self.byte_lanes = len(self.bus.tkeep)
@@ -275,7 +312,7 @@ class AxiStreamSource(object):
         self.byte_size = self.width // self.byte_lanes
         self.byte_mask = 2**self.byte_size-1
 
-        self.log.info("AXI stream source configuration:")
+        self.log.info("AXI stream %s configuration:", self._type)
         self.log.info("  Byte size: %d bits", self.byte_size)
         self.log.info("  Data width: %d bits (%d bytes)", self.width, self.byte_lanes)
         self.log.info("  tvalid: %s", "present" if hasattr(self.bus, "tvalid") else "not present")
@@ -302,7 +339,73 @@ class AxiStreamSource(object):
             raise ValueError(f"Bus does not evenly divide into byte lanes "
                 f"({self.byte_lanes} * {self.byte_size} != {self.width})")
 
-        cocotb.fork(self._run())
+        self._run_cr = None
+
+        self._init_reset(reset, reset_active_level)
+
+    def count(self):
+        return len(self.queue)
+
+    def empty(self):
+        return not self.queue
+
+    def clear(self):
+        self.queue.clear()
+        self.queue_occupancy_bytes = 0
+        self.queue_occupancy_frames = 0
+
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._run_cr is not None:
+                self._run_cr.kill()
+                self._run_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._run_cr is None:
+                self._run_cr = cocotb.fork(self._run())
+
+        self.active = False
+
+    async def _run(self):
+        raise NotImplementedError()
+
+
+class AxiStreamPause:
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self.pause = False
+        self._pause_generator = None
+        self._pause_cr = None
+
+    def set_pause_generator(self, generator=None):
+        if self._pause_cr is not None:
+            self._pause_cr.kill()
+            self._pause_cr = None
+
+        self._pause_generator = generator
+
+        if self._pause_generator is not None:
+            self._pause_cr = cocotb.fork(self._run_pause())
+
+    def clear_pause_generator(self):
+        self.set_pause_generator(None)
+
+    async def _run_pause(self):
+        for val in self._pause_generator:
+            self.pause = val
+            await RisingEdge(self.clock)
+
+
+class AxiStreamSource(AxiStreamBase, AxiStreamPause):
+
+    _type = "source"
+
+    _init_x = True
+
+    _valid_init = 0
+    _ready_init = None
 
     async def send(self, frame):
         self.send_nowait(frame)
@@ -319,12 +422,6 @@ class AxiStreamSource(object):
     def write_nowait(self, data):
         self.send_nowait(data)
 
-    def count(self):
-        return len(self.queue)
-
-    def empty(self):
-        return not self.queue
-
     def idle(self):
         return self.empty() and not self.active
 
@@ -332,34 +429,9 @@ class AxiStreamSource(object):
         while not self.idle():
             await RisingEdge(self.clock)
 
-    def set_pause_generator(self, generator=None):
-        if self._pause_cr is not None:
-            self._pause_cr.kill()
-            self._pause_cr = None
+    def _handle_reset(self, state):
+        super()._handle_reset(state)
 
-        self._pause_generator = generator
-
-        if self._pause_generator is not None:
-            self._pause_cr = cocotb.fork(self._run_pause())
-
-    def clear_pause_generator(self):
-        self.set_pause_generator(None)
-
-    async def _run(self):
-        frame = None
-        self.active = False
-
-        while True:
-            await ReadOnly()
-
-            # read handshake signals
-            tready_sample = (not hasattr(self.bus, "tready")) or self.bus.tready.value
-            tvalid_sample = (not hasattr(self.bus, "tvalid")) or self.bus.tvalid.value
-
-            if self.reset is not None and self.reset.value:
-                await RisingEdge(self.clock)
-                frame = None
-                self.active = False
         self.bus.tdata <= 0
         if hasattr(self.bus, "tvalid"):
             self.bus.tvalid <= 0
@@ -373,15 +445,25 @@ class AxiStreamSource(object):
             self.bus.tdest <= 0
         if hasattr(self.bus, "tuser"):
             self.bus.tuser <= 0
-                continue
 
+    async def _run(self):
+        frame = None
+        self.active = False
+
+        while True:
             await RisingEdge(self.clock)
 
+            # read handshake signals
+            tready_sample = (not hasattr(self.bus, "tready")) or self.bus.tready.value
+            tvalid_sample = (not hasattr(self.bus, "tvalid")) or self.bus.tvalid.value
+
             if (tready_sample and tvalid_sample) or not tvalid_sample:
                 if frame is None and self.queue:
                     frame = self.queue.popleft()
                     self.queue_occupancy_bytes -= len(frame)
                     self.queue_occupancy_frames -= 1
+                    frame.sim_time_start = get_sim_time()
+                    frame.sim_time_end = None
                     self.log.info("TX frame: %s", frame)
                     frame.normalize()
                     self.active = True
@@ -403,6 +485,8 @@ class AxiStreamSource(object):
 
                         if len(frame.tdata) == 0:
                             tlast_val = 1
+                            frame.sim_time_end = get_sim_time()
+                            frame.handle_tx_complete()
                             frame = None
                             break
 
@@ -426,101 +510,27 @@ class AxiStreamSource(object):
                         self.bus.tlast <= 0
                     self.active = bool(frame)
 
-    async def _run_pause(self):
-        for val in self._pause_generator:
-            self.pause = val
-            await RisingEdge(self.clock)
 
+class AxiStreamMonitor(AxiStreamBase):
 
-class AxiStreamSink(object):
+    _type = "monitor"
 
-    _signals = ["tdata"]
-    _optional_signals = ["tvalid", "tready", "tlast", "tkeep", "tid", "tdest", "tuser"]
+    _init_x = False
 
-    def __init__(self, entity, name, clock, reset=None, byte_size=None, byte_lanes=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
-        self.entity = entity
-        self.clock = clock
-        self.reset = reset
-        self.bus = Bus(self.entity, name, self._signals, optional_signals=self._optional_signals, **kwargs)
+    _valid_init = None
+    _ready_init = None
 
-        self.log.info("AXI stream sink")
-        self.log.info("cocotbext-axi version %s", __version__)
-        self.log.info("Copyright (c) 2020 Alex Forencich")
-        self.log.info("https://github.com/alexforencich/cocotbext-axi")
+    def __init__(self, bus, clock, reset=None, reset_active_level=True,
+            byte_size=None, byte_lanes=None, *args, **kwargs):
 
-        super().__init__(*args, **kwargs)
+        super().__init__(bus, clock, reset, reset_active_level, byte_size, byte_lanes, *args, **kwargs)
 
-        self.active = False
-        self.queue = deque()
-        self.sync = Event()
         self.read_queue = []
 
-        self.pause = False
-        self._pause_generator = None
-        self._pause_cr = None
-
-        self.queue_occupancy_bytes = 0
-        self.queue_occupancy_frames = 0
-        self.queue_occupancy_limit_bytes = None
-        self.queue_occupancy_limit_frames = None
-
-        self.width = len(self.bus.tdata)
-        self.byte_lanes = 1
-
-        self.reset = reset
-
-        if hasattr(self.bus, "tready"):
-            self.bus.tready.setimmediatevalue(0)
-
-        if hasattr(self.bus, "tkeep"):
-            self.byte_lanes = len(self.bus.tkeep)
-            if byte_size is not None or byte_lanes is not None:
-                raise ValueError("Cannot specify byte_size or byte_lanes if tkeep is connected")
-        else:
-            if byte_lanes is not None:
-                self.byte_lanes = byte_lanes
-                if byte_size is not None:
-                    raise ValueError("Cannot specify both byte_size and byte_lanes")
-            elif byte_size is not None:
-                self.byte_lanes = self.width // byte_size
-
-        self.byte_size = self.width // self.byte_lanes
-        self.byte_mask = 2**self.byte_size-1
-
-        self.log.info("AXI stream sink configuration:")
-        self.log.info("  Byte size: %d bits", self.byte_size)
-        self.log.info("  Data width: %d bits (%d bytes)", self.width, self.byte_lanes)
-        self.log.info("  tvalid: %s", "present" if hasattr(self.bus, "tvalid") else "not present")
-        self.log.info("  tready: %s", "present" if hasattr(self.bus, "tready") else "not present")
-        self.log.info("  tlast: %s", "present" if hasattr(self.bus, "tlast") else "not present")
-        if hasattr(self.bus, "tkeep"):
-            self.log.info("  tkeep width: %d bits", len(self.bus.tkeep))
-        else:
-            self.log.info("  tkeep: not present")
-        if hasattr(self.bus, "tid"):
-            self.log.info("  tid width: %d bits", len(self.bus.tid))
-        else:
-            self.log.info("  tid: not present")
-        if hasattr(self.bus, "tdest"):
-            self.log.info("  tdest width: %d bits", len(self.bus.tdest))
-        else:
-            self.log.info("  tdest: not present")
-        if hasattr(self.bus, "tuser"):
-            self.log.info("  tuser width: %d bits", len(self.bus.tuser))
-        else:
-            self.log.info("  tuser: not present")
-
-        if self.byte_lanes * self.byte_size != self.width:
-            raise ValueError(f"Bus does not evenly divide into byte lanes "
-                f"({self.byte_lanes} * {self.byte_size} != {self.width})")
-
-        cocotb.fork(self._run())
-
     async def recv(self, compact=True):
         while self.empty():
-            self.sync.clear()
-            await self.sync.wait()
+            self.queue_sync.clear()
+            await self.queue_sync.wait()
         return self.recv_nowait(compact)
 
     def recv_nowait(self, compact=True):
@@ -549,65 +559,37 @@ class AxiStreamSink(object):
         del self.read_queue[:count]
         return data
 
-    def count(self):
-        return len(self.queue)
-
-    def empty(self):
-        return not self.queue
-
-    def full(self):
-        if self.queue_occupancy_limit_bytes and self.queue_occupancy_bytes > self.queue_occupancy_limit_bytes:
-            return True
-        elif self.queue_occupancy_limit_frames and self.queue_occupancy_frames > self.queue_occupancy_limit_frames:
-            return True
-        else:
-            return False
-
     def idle(self):
         return not self.active
 
     async def wait(self, timeout=0, timeout_unit='ns'):
         if not self.empty():
             return
-        self.sync.clear()
+        self.queue_sync.clear()
         if timeout:
-            await First(self.sync.wait(), Timer(timeout, timeout_unit))
+            await First(self.queue_sync.wait(), Timer(timeout, timeout_unit))
         else:
-            await self.sync.wait()
-
-    def set_pause_generator(self, generator=None):
-        if self._pause_cr is not None:
-            self._pause_cr.kill()
-            self._pause_cr = None
-
-        self._pause_generator = generator
-
-        if self._pause_generator is not None:
-            self._pause_cr = cocotb.fork(self._run_pause())
-
-    def clear_pause_generator(self):
-        self.set_pause_generator(None)
+            await self.queue_sync.wait()
 
     async def _run(self):
-        frame = AxiStreamFrame([], [], [], [], [])
+        frame = None
         self.active = False
 
         while True:
-            await ReadOnly()
+            await RisingEdge(self.clock)
 
             # read handshake signals
             tready_sample = (not hasattr(self.bus, "tready")) or self.bus.tready.value
             tvalid_sample = (not hasattr(self.bus, "tvalid")) or self.bus.tvalid.value
 
-            if self.reset is not None and self.reset.value:
-                await RisingEdge(self.clock)
-                frame = AxiStreamFrame([], [], [], [], [])
-                self.active = False
-                if hasattr(self.bus, "tready"):
-                    self.bus.tready <= 0
-                continue
-
             if tready_sample and tvalid_sample:
+                if frame is None:
+                    if self.byte_size == 8:
+                        frame = AxiStreamFrame(bytearray(), [], [], [], [])
+                    else:
+                        frame = AxiStreamFrame([], [], [], [], [])
+                    frame.sim_time_start = get_sim_time()
+
                 for offset in range(self.byte_lanes):
 
                     frame.tdata.append((self.bus.tdata.value.integer >> (offset * self.byte_size)) & self.byte_mask)
@@ -621,174 +603,68 @@ class AxiStreamSink(object):
                         frame.tuser.append(self.bus.tuser.value.integer)
 
                 if not hasattr(self.bus, "tlast") or self.bus.tlast.value:
-                    if self.byte_size == 8:
-                        frame.tdata = bytearray(frame.tdata)
-
+                    frame.sim_time_end = get_sim_time()
                     self.log.info("RX frame: %s", frame)
 
                     self.queue_occupancy_bytes += len(frame)
                     self.queue_occupancy_frames += 1
 
                     self.queue.append(frame)
-                    self.sync.set()
+                    self.queue_sync.set()
 
-                    frame = AxiStreamFrame([], [], [], [], [])
+                    frame = None
 
-            await RisingEdge(self.clock)
+
+class AxiStreamSink(AxiStreamMonitor, AxiStreamPause):
+
+    _type = "sink"
+
+    _init_x = False
+
+    _valid_init = None
+    _ready_init = 0
+
+    def __init__(self, bus, clock, reset=None, reset_active_level=True,
+            byte_size=None, byte_lanes=None, *args, **kwargs):
+
+        super().__init__(bus, clock, reset, reset_active_level, byte_size, byte_lanes, *args, **kwargs)
+
+        self.queue_occupancy_limit_bytes = -1
+        self.queue_occupancy_limit_frames = -1
+
+    def full(self):
+        if self.queue_occupancy_limit_bytes > 0 and self.queue_occupancy_bytes > self.queue_occupancy_limit_bytes:
+            return True
+        elif self.queue_occupancy_limit_frames > 0 and self.queue_occupancy_frames > self.queue_occupancy_limit_frames:
+            return True
+        else:
+            return False
+
+    def _handle_reset(self, state):
+        super()._handle_reset(state)
 
         if hasattr(self.bus, "tready"):
-                self.bus.tready <= (not self.full() and not self.pause)
-
-    async def _run_pause(self):
-        for val in self._pause_generator:
-            self.pause = val
-            await RisingEdge(self.clock)
-
-
-class AxiStreamMonitor(object):
-
-    _signals = ["tdata"]
-    _optional_signals = ["tvalid", "tready", "tlast", "tkeep", "tid", "tdest", "tuser"]
-
-    def __init__(self, entity, name, clock, reset=None, byte_size=None, byte_lanes=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
-        self.entity = entity
-        self.clock = clock
-        self.reset = reset
-        self.bus = Bus(self.entity, name, self._signals, optional_signals=self._optional_signals, **kwargs)
-
-        self.log.info("AXI stream monitor")
-        self.log.info("cocotbext-axi version %s", __version__)
-        self.log.info("Copyright (c) 2020 Alex Forencich")
-        self.log.info("https://github.com/alexforencich/cocotbext-axi")
-
-        super().__init__(*args, **kwargs)
-
-        self.active = False
-        self.queue = deque()
-        self.sync = Event()
-        self.read_queue = []
-
-        self.queue_occupancy_bytes = 0
-        self.queue_occupancy_frames = 0
-
-        self.width = len(self.bus.tdata)
-        self.byte_lanes = 1
-
-        self.reset = reset
-
-        if hasattr(self.bus, "tkeep"):
-            self.byte_lanes = len(self.bus.tkeep)
-            if byte_size is not None or byte_lanes is not None:
-                raise ValueError("Cannot specify byte_size or byte_lanes if tkeep is connected")
-        else:
-            if byte_lanes is not None:
-                self.byte_lanes = byte_lanes
-                if byte_size is not None:
-                    raise ValueError("Cannot specify both byte_size and byte_lanes")
-            elif byte_size is not None:
-                self.byte_lanes = self.width // byte_size
-
-        self.byte_size = self.width // self.byte_lanes
-        self.byte_mask = 2**self.byte_size-1
-
-        self.log.info("AXI stream monitor configuration:")
-        self.log.info("  Byte size: %d bits", self.byte_size)
-        self.log.info("  Data width: %d bits (%d bytes)", self.width, self.byte_lanes)
-        self.log.info("  tvalid: %s", "present" if hasattr(self.bus, "tvalid") else "not present")
-        self.log.info("  tready: %s", "present" if hasattr(self.bus, "tready") else "not present")
-        self.log.info("  tlast: %s", "present" if hasattr(self.bus, "tlast") else "not present")
-        if hasattr(self.bus, "tkeep"):
-            self.log.info("  tkeep width: %d bits", len(self.bus.tkeep))
-        else:
-            self.log.info("  tkeep: not present")
-        if hasattr(self.bus, "tid"):
-            self.log.info("  tid width: %d bits", len(self.bus.tid))
-        else:
-            self.log.info("  tid: not present")
-        if hasattr(self.bus, "tdest"):
-            self.log.info("  tdest width: %d bits", len(self.bus.tdest))
-        else:
-            self.log.info("  tdest: not present")
-        if hasattr(self.bus, "tuser"):
-            self.log.info("  tuser width: %d bits", len(self.bus.tuser))
-        else:
-            self.log.info("  tuser: not present")
-
-        if self.byte_lanes * self.byte_size != self.width:
-            raise ValueError(f"Bus does not evenly divide into byte lanes "
-                f"({self.byte_lanes} * {self.byte_size} != {self.width})")
-
-        cocotb.fork(self._run())
-
-    async def recv(self, compact=True):
-        while self.empty():
-            self.sync.clear()
-            await self.sync.wait()
-        return self.recv_nowait(compact)
-
-    def recv_nowait(self, compact=True):
-        if self.queue:
-            frame = self.queue.popleft()
-            self.queue_occupancy_bytes -= len(frame)
-            self.queue_occupancy_frames -= 1
-            if compact:
-                frame.compact()
-            return frame
-        return None
-
-    async def read(self, count=-1):
-        while not self.read_queue:
-            frame = await self.recv(compact=True)
-            self.read_queue.extend(frame.tdata)
-        return self.read_nowait(count)
-
-    def read_nowait(self, count=-1):
-        while not self.empty():
-            frame = self.recv_nowait(compact=True)
-            self.read_queue.extend(frame.tdata)
-        if count < 0:
-            count = len(self.read_queue)
-        data = self.read_queue[:count]
-        del self.read_queue[:count]
-        return data
-
-    def count(self):
-        return len(self.queue)
-
-    def empty(self):
-        return not self.queue
-
-    def idle(self):
-        return not self.active
-
-    async def wait(self, timeout=0, timeout_unit='ns'):
-        if not self.empty():
-            return
-        self.sync.clear()
-        if timeout:
-            await First(self.sync.wait(), Timer(timeout, timeout_unit))
-        else:
-            await self.sync.wait()
+            self.bus.tready <= 0
 
     async def _run(self):
-        frame = AxiStreamFrame([], [], [], [], [])
+        frame = None
         self.active = False
 
         while True:
-            await ReadOnly()
+            await RisingEdge(self.clock)
 
             # read handshake signals
             tready_sample = (not hasattr(self.bus, "tready")) or self.bus.tready.value
             tvalid_sample = (not hasattr(self.bus, "tvalid")) or self.bus.tvalid.value
 
-            if self.reset is not None and self.reset.value:
-                await RisingEdge(self.clock)
-                frame = AxiStreamFrame([], [], [], [], [])
-                self.active = False
-                continue
-
             if tready_sample and tvalid_sample:
+                if frame is None:
+                    if self.byte_size == 8:
+                        frame = AxiStreamFrame(bytearray(), [], [], [], [])
+                    else:
+                        frame = AxiStreamFrame([], [], [], [], [])
+                    frame.sim_time_start = get_sim_time()
+
                 for offset in range(self.byte_lanes):
 
                     frame.tdata.append((self.bus.tdata.value.integer >> (offset * self.byte_size)) & self.byte_mask)
@@ -802,14 +678,16 @@ class AxiStreamMonitor(object):
                         frame.tuser.append(self.bus.tuser.value.integer)
 
                 if not hasattr(self.bus, "tlast") or self.bus.tlast.value:
-                    if self.byte_size == 8:
-                        frame.tdata = bytearray(frame.tdata)
-
+                    frame.sim_time_end = get_sim_time()
                     self.log.info("RX frame: %s", frame)
 
+                    self.queue_occupancy_bytes += len(frame)
+                    self.queue_occupancy_frames += 1
+
                     self.queue.append(frame)
-                    self.sync.set()
+                    self.queue_sync.set()
 
-                    frame = AxiStreamFrame([], [], [], [], [])
+                    frame = None
 
-            await RisingEdge(self.clock)
+            if hasattr(self.bus, "tready"):
+                self.bus.tready <= (not self.full() and not self.pause)

cocotbext/axi/memory.py

@@ -27,7 +27,7 @@ import mmap
 from .utils import hexdump, hexdump_lines, hexdump_str
 
 
-class Memory(object):
+class Memory:
     def __init__(self, size=1024, mem=None, *args, **kwargs):
         if mem is not None:
             self.mem = mem

cocotbext/axi/reset.py

@@ -0,0 +1,66 @@
+"""
+
+Copyright (c) 2020 Alex Forencich
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+"""
+
+import cocotb
+from cocotb.triggers import RisingEdge, FallingEdge
+
+
+class Reset:
+    def _init_reset(self, reset_signal=None, active_level=True):
+        self._local_reset = False
+        self._ext_reset = False
+        self._reset_state = True
+
+        if reset_signal is not None:
+            cocotb.fork(self._run_reset(reset_signal, bool(active_level)))
+
+        self._update_reset()
+
+    def assert_reset(self, val=None):
+        if val is None:
+            self.assert_reset(True)
+            self.assert_reset(False)
+        else:
+            self._local_reset = bool(val)
+            self._update_reset()
+
+    def _update_reset(self):
+        new_state = self._local_reset or self._ext_reset
+        if self._reset_state != new_state:
+            self._reset_state = new_state
+            self._handle_reset(new_state)
+
+    def _handle_reset(self, state):
+        pass
+
+    async def _run_reset(self, reset_signal, active_level):
+        while True:
+            if bool(reset_signal.value):
+                await FallingEdge(reset_signal)
+                self._ext_reset = not active_level
+                self._update_reset()
+            else:
+                await RisingEdge(reset_signal)
+                self._ext_reset = active_level
+                self._update_reset()

cocotbext/axi/stream.py

@@ -26,11 +26,30 @@ import logging
 from collections import deque
 
 import cocotb
-from cocotb.triggers import RisingEdge, ReadOnly, Event, First, Timer
+from cocotb.triggers import RisingEdge, Event, First, Timer
 from cocotb.bus import Bus
 
+from .reset import Reset
 
-class StreamTransaction(object):
+
+class StreamBus(Bus):
+
+    _signals = ["data"]
+    _optional_signals = []
+
+    def __init__(self, entity=None, prefix=None, **kwargs):
+        super().__init__(entity, prefix, self._signals, optional_signals=self._optional_signals, **kwargs)
+
+    @classmethod
+    def from_entity(cls, entity, **kwargs):
+        return cls(entity, **kwargs)
+
+    @classmethod
+    def from_prefix(cls, entity, prefix, **kwargs):
+        return cls(entity, prefix, **kwargs)
+
+
+class StreamTransaction:
 
     _signals = ["data"]
 
@@ -48,7 +67,7 @@ class StreamTransaction(object):
         return f"{type(self).__name__}({', '.join(f'{s}={int(getattr(self, s))}' for s in self._signals)})"
 
 
-class StreamBase(object):
+class StreamBase(Reset):
 
     _signals = ["data", "valid", "ready"]
     _optional_signals = []
@@ -63,16 +82,18 @@ class StreamBase(object):
     _ready_init = None
 
     _transaction_obj = StreamTransaction
+    _bus_obj = StreamBus
 
-    def __init__(self, entity, name, clock, reset=None, *args, **kwargs):
-        self.log = logging.getLogger(f"cocotb.{entity._name}.{name}")
-        self.entity = entity
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, *args, **kwargs):
+        self.bus = bus
         self.clock = clock
         self.reset = reset
-        self.bus = Bus(self.entity, name, self._signals, optional_signals=self._optional_signals, **kwargs)
+        self.log = logging.getLogger(f"cocotb.{bus._entity._name}.{bus._name}")
 
         super().__init__(*args, **kwargs)
 
+        self.active = False
+
         self.queue = deque()
         self.queue_sync = Event()
 
@@ -98,6 +119,10 @@ class StreamBase(object):
                     v.binstr = 'x'*len(v)
                     getattr(self.bus, sig).setimmediatevalue(v)
 
+        self._run_cr = None
+
+        self._init_reset(reset, reset_active_level)
+
     def count(self):
         return len(self.queue)
 
@@ -107,8 +132,24 @@ class StreamBase(object):
     def clear(self):
         self.queue.clear()
 
+    def _handle_reset(self, state):
+        if state:
+            self.log.info("Reset asserted")
+            if self._run_cr is not None:
+                self._run_cr.kill()
+                self._run_cr = None
+        else:
+            self.log.info("Reset de-asserted")
+            if self._run_cr is None:
+                self._run_cr = cocotb.fork(self._run())
 
-class StreamPause(object):
+        self.active = False
+
+    async def _run(self):
+        raise NotImplementedError()
+
+
+class StreamPause:
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
@@ -137,44 +178,16 @@ class StreamPause(object):
 
 class StreamSource(StreamBase, StreamPause):
 
-    _signals = ["data", "valid", "ready"]
-    _optional_signals = []
-
-    _signal_widths = {"valid": 1, "ready": 1}
-
     _init_x = True
 
-    _valid_signal = "valid"
     _valid_init = 0
-    _ready_signal = "ready"
     _ready_init = None
 
-    _transaction_obj = StreamTransaction
-
-    def __init__(self, entity, name, clock, reset=None, *args, **kwargs):
-        super().__init__(entity, name, clock, reset, *args, **kwargs)
-
-        self.drive_obj = None
-        self.drive_sync = Event()
-
-        self.active = False
-
-        cocotb.fork(self._run_source())
-        cocotb.fork(self._run())
-
-    async def drive(self, obj):
-        if self.drive_obj is not None:
-            self.drive_sync.clear()
-            await self.drive_sync.wait()
-
-        self.drive_obj = obj
-
     async def send(self, obj):
         self.send_nowait(obj)
 
     def send_nowait(self, obj):
         self.queue.append(obj)
-        self.queue_sync.set()
 
     def idle(self):
         return self.empty() and not self.active
@@ -183,142 +196,39 @@ class StreamSource(StreamBase, StreamPause):
         while not self.idle():
             await RisingEdge(self.clock)
 
-    def clear(self):
-        self.queue.clear()
-        self.drive_obj = None
-        self.drive_sync.set()
+    def _handle_reset(self, state):
+        super()._handle_reset(state)
 
-    async def _run_source(self):
+        if self.valid is not None:
+            self.valid <= 0
+
+    async def _run(self):
         while True:
-            await ReadOnly()
+            await RisingEdge(self.clock)
 
             # read handshake signals
             ready_sample = self.ready is None or self.ready.value
             valid_sample = self.valid is None or self.valid.value
 
-            if self.reset is not None and self.reset.value:
-                await RisingEdge(self.clock)
-                self.clear()
-                if self.valid is not None:
-                    self.valid <= 0
-                self.active = False
-                continue
-
-            await RisingEdge(self.clock)
-
             if (ready_sample and valid_sample) or (not valid_sample):
-                if self.drive_obj and not self.pause:
-                    self.bus.drive(self.drive_obj)
-                    self.drive_obj = None
-                    self.drive_sync.set()
+                if self.queue and not self.pause:
+                    self.bus.drive(self.queue.popleft())
                     if self.valid is not None:
                         self.valid <= 1
                     self.active = True
                 else:
                     if self.valid is not None:
                         self.valid <= 0
-                    self.active = bool(self.drive_obj)
-
-    async def _run(self):
-        while True:
-            while not self.queue:
-                self.queue_sync.clear()
-                await self.queue_sync.wait()
-
-            await self.drive(self.queue.popleft())
-
-
-class StreamSink(StreamBase, StreamPause):
-
-    _signals = ["data", "valid", "ready"]
-    _optional_signals = []
-
-    _signal_widths = {"valid": 1, "ready": 1}
-
-    _init_x = False
-
-    _valid_signal = "valid"
-    _valid_init = None
-    _ready_signal = "ready"
-    _ready_init = 0
-
-    _transaction_obj = StreamTransaction
-
-    def __init__(self, entity, name, clock, reset=None, *args, **kwargs):
-        super().__init__(entity, name, clock, reset, *args, **kwargs)
-
-        cocotb.fork(self._run_sink())
-
-    async def recv(self):
-        while self.empty():
-            self.queue_sync.clear()
-            await self.queue_sync.wait()
-        return self.recv_nowait()
-
-    def recv_nowait(self):
-        if self.queue:
-            return self.queue.popleft()
-        return None
-
-    async def wait(self, timeout=0, timeout_unit=None):
-        if not self.empty():
-            return
-        self.queue_sync.clear()
-        if timeout:
-            await First(self.queue_sync.wait(), Timer(timeout, timeout_unit))
-        else:
-            await self.queue_sync.wait()
-
-    def callback(self, obj):
-        self.queue.append(obj)
-        self.queue_sync.set()
-
-    async def _run_sink(self):
-        while True:
-            await ReadOnly()
-
-            # read handshake signals
-            ready_sample = self.ready is None or self.ready.value
-            valid_sample = self.valid is None or self.valid.value
-
-            if self.reset is not None and self.reset.value:
-                await RisingEdge(self.clock)
-                self.clear()
-                if self.ready is not None:
-                    self.ready <= 0
-                continue
-
-            if ready_sample and valid_sample:
-                obj = self._transaction_obj()
-                self.bus.sample(obj)
-                self.callback(obj)
-
-            await RisingEdge(self.clock)
-            if self.ready is not None:
-                self.ready <= (not self.pause)
+                    self.active = bool(self.queue)
 
 
 class StreamMonitor(StreamBase):
 
-    _signals = ["data", "valid", "ready"]
-    _optional_signals = []
-
-    _signal_widths = {"valid": 1, "ready": 1}
-
     _init_x = False
 
-    _valid_signal = "valid"
     _valid_init = None
-    _ready_signal = "ready"
     _ready_init = None
 
-    _transaction_obj = StreamTransaction
-
-    def __init__(self, entity, name, clock, reset=None, *args, **kwargs):
-        super().__init__(entity, name, clock, reset, *args, **kwargs)
-
-        cocotb.fork(self._run_monitor())
-
     async def recv(self):
         while self.empty():
             self.queue_sync.clear()
@@ -330,12 +240,6 @@ class StreamMonitor(StreamBase):
             return self.queue.popleft()
         return None
 
-    def count(self):
-        return len(self.queue)
-
-    def empty(self):
-        return not self.queue
-
     async def wait(self, timeout=0, timeout_unit=None):
         if not self.empty():
             return
@@ -345,29 +249,61 @@ class StreamMonitor(StreamBase):
         else:
             await self.queue_sync.wait()
 
-    def callback(self, obj):
-        self.queue.append(obj)
-        self.queue_sync.set()
-
-    async def _run_monitor(self):
+    async def _run(self):
         while True:
-            await ReadOnly()
+            await RisingEdge(self.clock)
 
             # read handshake signals
             ready_sample = self.ready is None or self.ready.value
             valid_sample = self.valid is None or self.valid.value
 
-            if self.reset is not None and self.reset.value:
+            if ready_sample and valid_sample:
+                obj = self._transaction_obj()
+                self.bus.sample(obj)
+                self.queue.append(obj)
+                self.queue_sync.set()
+
+
+class StreamSink(StreamMonitor, StreamPause):
+
+    _init_x = False
+
+    _valid_init = None
+    _ready_init = 0
+
+    def __init__(self, bus, clock, reset=None, reset_active_level=True, *args, **kwargs):
+        super().__init__(bus, clock, reset, reset_active_level, *args, **kwargs)
+
+        self.queue_occupancy_limit = -1
+
+    def full(self):
+        if self.queue_occupancy_limit > 0 and len(self.queue) >= self.queue_occupancy_limit:
+            return True
+        else:
+            return False
+
+    def _handle_reset(self, state):
+        super()._handle_reset(state)
+
+        if self.ready is not None:
+            self.ready <= 0
+
+    async def _run(self):
+        while True:
             await RisingEdge(self.clock)
-                self.clear()
-                continue
+
+            # read handshake signals
+            ready_sample = self.ready is None or self.ready.value
+            valid_sample = self.valid is None or self.valid.value
 
             if ready_sample and valid_sample:
                 obj = self._transaction_obj()
                 self.bus.sample(obj)
-                self.callback(obj)
+                self.queue.append(obj)
+                self.queue_sync.set()
 
-            await RisingEdge(self.clock)
+            if self.ready is not None:
+                self.ready <= (not self.full() and not self.pause)
 
 
 def define_stream(name, signals, optional_signals=None, valid_signal=None, ready_signal=None, signal_widths=None):
@@ -408,6 +344,11 @@ def define_stream(name, signals, optional_signals=None, valid_signal=None, ready
         if s not in (ready_signal, valid_signal):
             filtered_signals.append(s)
 
+    attrib = {}
+    attrib['_signals'] = signals
+    attrib['_optional_signals'] = optional_signals
+    bus = type(name+"Bus", (StreamBus,), attrib)
+
     attrib = {s: 0 for s in filtered_signals}
     attrib['_signals'] = filtered_signals
 
@@ -420,9 +361,10 @@ def define_stream(name, signals, optional_signals=None, valid_signal=None, ready
     attrib['_ready_signal'] = ready_signal
     attrib['_valid_signal'] = valid_signal
     attrib['_transaction_obj'] = transaction
+    attrib['_bus_obj'] = bus
 
     source = type(name+"Source", (StreamSource,), attrib)
     sink = type(name+"Sink", (StreamSink,), attrib)
     monitor = type(name+"Monitor", (StreamMonitor,), attrib)
 
-    return transaction, source, sink, monitor
+    return bus, transaction, source, sink, monitor

cocotbext/axi/utils.py

@@ -23,28 +23,28 @@ THE SOFTWARE.
 """
 
 
-def hexdump_line(data, offset):
+def hexdump_line(data, offset, row_size=16):
     h = ""
     c = ""
-    for ch in data[0:16]:
+    for ch in data[0:row_size]:
         h += f"{ch:02x} "
         c += chr(ch) if 32 < ch < 127 else "."
-    return f"{offset:08x}: {h:48} {c}"
+    return f"{offset:08x}: {h:{row_size*3}} {c}"
 
 
-def hexdump(data, start=0, length=None, prefix="", offset=0):
+def hexdump(data, start=0, length=None, row_size=16, prefix="", offset=0):
     stop = min(start+length, len(data)) if length else len(data)
-    for k in range(start, stop, 16):
-        print(prefix+hexdump_line(data[k:min(k+16, stop)], k+offset))
+    for k in range(start, stop, row_size):
+        print(prefix+hexdump_line(data[k:min(k+row_size, stop)], k+offset, row_size))
 
 
-def hexdump_lines(data, start=0, length=None, prefix="", offset=0):
+def hexdump_lines(data, start=0, length=None, row_size=16, prefix="", offset=0):
     lines = []
     stop = min(start+length, len(data)) if length else len(data)
-    for k in range(start, stop, 16):
-        lines.append(prefix+hexdump_line(data[k:min(k+16, stop)], k+offset))
+    for k in range(start, stop, row_size):
+        lines.append(prefix+hexdump_line(data[k:min(k+row_size, stop)], k+offset, row_size))
     return lines
 
 
-def hexdump_str(data, start=0, length=None, prefix="", offset=0):
-    return "\n".join(hexdump_lines(data, start, length, prefix, offset))
+def hexdump_str(data, start=0, length=None, row_size=16, prefix="", offset=0):
+    return "\n".join(hexdump_lines(data, start, length, row_size, prefix, offset))

cocotbext/axi/version.py

@@ -1 +1 @@
-__version__ = "0.1.4"
+__version__ = "0.1.6"

tests/axi/Makefile

@@ -42,8 +42,6 @@ export PARAM_BUSER_WIDTH ?= 1
 export PARAM_ARUSER_WIDTH ?= 1
 export PARAM_RUSER_WIDTH ?= 1
 
-SIM_BUILD ?= sim_build_$(MODULE)-$(PARAM_DATA_WIDTH)
-
 ifeq ($(SIM), icarus)
 	PLUSARGS += -fst
 
@@ -79,6 +77,8 @@ else ifeq ($(SIM), verilator)
 	endif
 endif
 
+include $(shell cocotb-config --makefiles)/Makefile.sim
+
 iverilog_dump.v:
 	echo 'module iverilog_dump();' > $@
 	echo 'initial begin' >> $@
@@ -88,9 +88,5 @@ iverilog_dump.v:
 	echo 'endmodule' >> $@
 
 clean::
-	@rm -rf sim_build_*
 	@rm -rf iverilog_dump.v
 	@rm -rf dump.fst $(TOPLEVEL).fst
-
-include $(shell cocotb-config --makefiles)/Makefile.sim
-

tests/axi/test_axi.py

@@ -35,10 +35,10 @@ from cocotb.clock import Clock
 from cocotb.triggers import RisingEdge, Timer
 from cocotb.regression import TestFactory
 
-from cocotbext.axi import AxiMaster, AxiRam
+from cocotbext.axi import AxiBus, AxiMaster, AxiRam
 
 
-class TB(object):
+class TB:
     def __init__(self, dut):
         self.dut = dut
 
@@ -47,8 +47,8 @@ class TB(object):
 
         cocotb.fork(Clock(dut.clk, 2, units="ns").start())
 
-        self.axi_master = AxiMaster(dut, "axi", dut.clk, dut.rst)
-        self.axi_ram = AxiRam(dut, "axi", dut.clk, dut.rst, size=2**16)
+        self.axi_master = AxiMaster(AxiBus.from_prefix(dut, "axi"), dut.clk, dut.rst)
+        self.axi_ram = AxiRam(AxiBus.from_prefix(dut, "axi"), dut.clk, dut.rst, size=2**16)
 
         self.axi_ram.write_if.log.setLevel(logging.DEBUG)
         self.axi_ram.read_if.log.setLevel(logging.DEBUG)
@@ -311,7 +311,6 @@ if cocotb.SIM_NAME:
 # cocotb-test
 
 tests_dir = os.path.dirname(__file__)
-rtl_dir = os.path.abspath(os.path.join(tests_dir, '..', '..', 'rtl'))
 
 
 @pytest.mark.parametrize("data_width", [8, 16, 32])
@@ -338,8 +337,8 @@ def test_axi(request, data_width):
 
     extra_env = {f'PARAM_{k}': str(v) for k, v in parameters.items()}
 
-    sim_build = os.path.join(tests_dir,
-        "sim_build_"+request.node.name.replace('[', '-').replace(']', ''))
+    sim_build = os.path.join(tests_dir, "sim_build",
+        request.node.name.replace('[', '-').replace(']', ''))
 
     cocotb_test.simulator.run(
         python_search=[tests_dir],

tests/axil/Makefile

@@ -36,8 +36,6 @@ export PARAM_DATA_WIDTH ?= 32
 export PARAM_ADDR_WIDTH ?= 32
 export PARAM_STRB_WIDTH ?= $(shell expr $(PARAM_DATA_WIDTH) / 8 )
 
-SIM_BUILD ?= sim_build_$(MODULE)-$(PARAM_DATA_WIDTH)
-
 ifeq ($(SIM), icarus)
 	PLUSARGS += -fst
 
@@ -61,6 +59,8 @@ else ifeq ($(SIM), verilator)
 	endif
 endif
 
+include $(shell cocotb-config --makefiles)/Makefile.sim
+
 iverilog_dump.v:
 	echo 'module iverilog_dump();' > $@
 	echo 'initial begin' >> $@
@@ -70,9 +70,5 @@ iverilog_dump.v:
 	echo 'endmodule' >> $@
 
 clean::
-	@rm -rf sim_build_*
 	@rm -rf iverilog_dump.v
 	@rm -rf dump.fst $(TOPLEVEL).fst
-
-include $(shell cocotb-config --makefiles)/Makefile.sim
-

tests/axil/test_axil.py

@@ -35,10 +35,10 @@ from cocotb.clock import Clock
 from cocotb.triggers import RisingEdge, Timer
 from cocotb.regression import TestFactory
 
-from cocotbext.axi import AxiLiteMaster, AxiLiteRam
+from cocotbext.axi import AxiLiteBus, AxiLiteMaster, AxiLiteRam
 
 
-class TB(object):
+class TB:
     def __init__(self, dut):
         self.dut = dut
 
@@ -47,8 +47,8 @@ class TB(object):
 
         cocotb.fork(Clock(dut.clk, 2, units="ns").start())
 
-        self.axil_master = AxiLiteMaster(dut, "axil", dut.clk, dut.rst)
-        self.axil_ram = AxiLiteRam(dut, "axil", dut.clk, dut.rst, size=2**16)
+        self.axil_master = AxiLiteMaster(AxiLiteBus.from_prefix(dut, "axil"), dut.clk, dut.rst)
+        self.axil_ram = AxiLiteRam(AxiLiteBus.from_prefix(dut, "axil"), dut.clk, dut.rst, size=2**16)
 
     def set_idle_generator(self, generator=None):
         if generator:
@@ -295,7 +295,6 @@ if cocotb.SIM_NAME:
 # cocotb-test
 
 tests_dir = os.path.dirname(__file__)
-rtl_dir = os.path.abspath(os.path.join(tests_dir, '..', '..', 'rtl'))
 
 
 @pytest.mark.parametrize("data_width", [8, 16, 32])
@@ -316,8 +315,8 @@ def test_axil(request, data_width):
 
     extra_env = {f'PARAM_{k}': str(v) for k, v in parameters.items()}
 
-    sim_build = os.path.join(tests_dir,
-        "sim_build_"+request.node.name.replace('[', '-').replace(']', ''))
+    sim_build = os.path.join(tests_dir, "sim_build",
+        request.node.name.replace('[', '-').replace(']', ''))
 
     cocotb_test.simulator.run(
         python_search=[tests_dir],

tests/axis/Makefile

@@ -38,8 +38,6 @@ export PARAM_ID_WIDTH ?= 8
 export PARAM_DEST_WIDTH ?= 8
 export PARAM_USER_WIDTH ?= 1
 
-SIM_BUILD ?= sim_build_$(MODULE)-$(PARAM_DATA_WIDTH)
-
 ifeq ($(SIM), icarus)
 	PLUSARGS += -fst
 
@@ -67,6 +65,8 @@ else ifeq ($(SIM), verilator)
 	endif
 endif
 
+include $(shell cocotb-config --makefiles)/Makefile.sim
+
 iverilog_dump.v:
 	echo 'module iverilog_dump();' > $@
 	echo 'initial begin' >> $@
@@ -76,9 +76,5 @@ iverilog_dump.v:
 	echo 'endmodule' >> $@
 
 clean::
-	@rm -rf sim_build_*
 	@rm -rf iverilog_dump.v
 	@rm -rf dump.fst $(TOPLEVEL).fst
-
-include $(shell cocotb-config --makefiles)/Makefile.sim
-

tests/axis/test_axis.py

@@ -35,10 +35,10 @@ from cocotb.clock import Clock
 from cocotb.triggers import RisingEdge
 from cocotb.regression import TestFactory
 
-from cocotbext.axi import AxiStreamFrame, AxiStreamSource, AxiStreamSink, AxiStreamMonitor
+from cocotbext.axi import AxiStreamFrame, AxiStreamBus, AxiStreamSource, AxiStreamSink, AxiStreamMonitor
 
 
-class TB(object):
+class TB:
     def __init__(self, dut):
         self.dut = dut
 
@@ -47,9 +47,9 @@ class TB(object):
 
         cocotb.fork(Clock(dut.clk, 2, units="ns").start())
 
-        self.source = AxiStreamSource(dut, "axis", dut.clk, dut.rst)
-        self.sink = AxiStreamSink(dut, "axis", dut.clk, dut.rst)
-        self.monitor = AxiStreamMonitor(dut, "axis", dut.clk, dut.rst)
+        self.source = AxiStreamSource(AxiStreamBus.from_prefix(dut, "axis"), dut.clk, dut.rst)
+        self.sink = AxiStreamSink(AxiStreamBus.from_prefix(dut, "axis"), dut.clk, dut.rst)
+        self.monitor = AxiStreamMonitor(AxiStreamBus.from_prefix(dut, "axis"), dut.clk, dut.rst)
 
     def set_idle_generator(self, generator=None):
         if generator:
@@ -104,12 +104,15 @@ async def run_test(dut, payload_lengths=None, payload_data=None, idle_inserter=N
         assert rx_frame.tdest == test_frame.tdest
         assert not rx_frame.tuser
 
-        rx_frame = await tb.monitor.recv()
+        mon_rx_frame = await tb.monitor.recv()
 
-        assert rx_frame.tdata == test_frame.tdata
-        assert rx_frame.tid == test_frame.tid
-        assert rx_frame.tdest == test_frame.tdest
-        assert not rx_frame.tuser
+        assert mon_rx_frame.tdata == test_frame.tdata
+        assert mon_rx_frame.tid == test_frame.tid
+        assert mon_rx_frame.tdest == test_frame.tdest
+        assert not mon_rx_frame.tuser
+
+        assert rx_frame.sim_time_start == mon_rx_frame.sim_time_start
+        assert rx_frame.sim_time_end == mon_rx_frame.sim_time_end
 
     assert tb.sink.empty()
     assert tb.monitor.empty()
@@ -145,7 +148,6 @@ if cocotb.SIM_NAME:
 # cocotb-test
 
 tests_dir = os.path.dirname(__file__)
-rtl_dir = os.path.abspath(os.path.join(tests_dir, '..', '..', 'rtl'))
 
 
 @pytest.mark.parametrize("data_width", [8, 16, 32])
@@ -168,8 +170,8 @@ def test_axis(request, data_width):
 
     extra_env = {f'PARAM_{k}': str(v) for k, v in parameters.items()}
 
-    sim_build = os.path.join(tests_dir,
-        "sim_build_"+request.node.name.replace('[', '-').replace(']', ''))
+    sim_build = os.path.join(tests_dir, "sim_build",
+        request.node.name.replace('[', '-').replace(']', ''))
 
     cocotb_test.simulator.run(
         python_search=[tests_dir],