diff --git a/docs/cpuif/avalon.rst b/docs/cpuif/avalon.rst
new file mode 100644
index 0000000..547c508
--- /dev/null
+++ b/docs/cpuif/avalon.rst
@@ -0,0 +1,32 @@
+Intel Avalon
+============
+
+Implements the register block using an
+`Intel Avalon MM <https://www.intel.com/content/www/us/en/docs/programmable/683091/22-3/memory-mapped-interfaces.html>`_
+CPU interface.
+
+The Avalon interface comes in two i/o port flavors:
+
+SystemVerilog Interface
+    Class: :class:`peakrdl_regblock.cpuif.avalon.Avalon_Cpuif`
+
+    Interface Definition: :download:`avalon_mm_intf.sv <../../hdl-src/avalon_mm_intf.sv>`
+
+Flattened inputs/outputs
+    Flattens the interface into discrete input and output ports.
+
+    Class: :class:`peakrdl_regblock.cpuif.avalon.Avalon_Cpuif_flattened`
+
+
+Implementation Details
+----------------------
+This implementation of the Avalon protocol has the following features:
+
+* Interface uses word addressing.
+* Supports `pipelined transfers <https://www.intel.com/content/www/us/en/docs/programmable/683091/22-3/pipelined-transfers.html>`_
+* Responses may have variable latency
+
+  In most cases, latency is fixed and is determined by how many retiming
+  stages are enabled in your design.
+  However if your design contains external components, access latency is
+  not guaranteed to be uniform.
diff --git a/docs/index.rst b/docs/index.rst
index a068d90..be9e00e 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -112,6 +112,7 @@ Links
     cpuif/introduction
     cpuif/apb
     cpuif/axi4lite
+    cpuif/avalon
     cpuif/passthrough
     cpuif/internal_protocol
     cpuif/customizing
diff --git a/hdl-src/avalon_mm_intf.sv b/hdl-src/avalon_mm_intf.sv
new file mode 100644
index 0000000..1d3d0c3
--- /dev/null
+++ b/hdl-src/avalon_mm_intf.sv
@@ -0,0 +1,46 @@
+interface avalon_mm_intf #(
+    parameter DATA_WIDTH = 32,
+    parameter ADDR_WIDTH = 32 // Important! Avalon uses word addressing
+);
+    // Command
+    logic read;
+    logic write;
+    logic waitrequest;
+    logic [ADDR_WIDTH-1:0] address;
+    logic [DATA_WIDTH-1:0] writedata;
+    logic [DATA_WIDTH/8-1:0] byteenable;
+
+    // Response
+    logic readdatavalid;
+    logic writeresponsevalid;
+    logic [DATA_WIDTH-1:0] readdata;
+    logic [1:0] response;
+
+    modport host (
+        output read,
+        output write,
+        input waitrequest,
+        output address,
+        output writedata,
+        output byteenable,
+
+        input readdatavalid,
+        input writeresponsevalid,
+        input readdata,
+        input response
+    );
+
+    modport agent (
+        input read,
+        input write,
+        output waitrequest,
+        input address,
+        input writedata,
+        input byteenable,
+
+        output readdatavalid,
+        output writeresponsevalid,
+        output readdata,
+        output response
+    );
+endinterface
diff --git a/src/peakrdl_regblock/__peakrdl__.py b/src/peakrdl_regblock/__peakrdl__.py
index b08131a..c7de7a5 100644
--- a/src/peakrdl_regblock/__peakrdl__.py
+++ b/src/peakrdl_regblock/__peakrdl__.py
@@ -6,7 +6,7 @@ from peakrdl.plugins.exporter import ExporterSubcommandPlugin #pylint: disable=i
 from peakrdl.config import schema #pylint: disable=import-error
 
 from .exporter import RegblockExporter
-from .cpuif import apb3, apb4, axi4lite, passthrough, CpuifBase
+from .cpuif import CpuifBase, apb3, apb4, axi4lite, passthrough, avalon
 from .udps import ALL_UDPS
 from . import entry_points
 
@@ -48,13 +48,15 @@ class Exporter(ExporterSubcommandPlugin):
 
         # All built-in CPUIFs
         cpuifs = {
+            "passthrough": passthrough.PassthroughCpuif,
             "apb3": apb3.APB3_Cpuif,
             "apb3-flat": apb3.APB3_Cpuif_flattened,
             "apb4": apb4.APB4_Cpuif,
             "apb4-flat": apb4.APB4_Cpuif_flattened,
             "axi4-lite": axi4lite.AXI4Lite_Cpuif,
             "axi4-lite-flat": axi4lite.AXI4Lite_Cpuif_flattened,
-            "passthrough": passthrough.PassthroughCpuif
+            "avalon-mm": avalon.Avalon_Cpuif,
+            "avalon-mm-flat": avalon.Avalon_Cpuif_flattened,
         }
 
         # Load any cpuifs specified via entry points
diff --git a/src/peakrdl_regblock/cpuif/avalon/__init__.py b/src/peakrdl_regblock/cpuif/avalon/__init__.py
new file mode 100644
index 0000000..aaed77d
--- /dev/null
+++ b/src/peakrdl_regblock/cpuif/avalon/__init__.py
@@ -0,0 +1,37 @@
+from ..base import CpuifBase
+from ...utils import clog2
+
+class Avalon_Cpuif(CpuifBase):
+    template_path = "avalon_tmpl.sv"
+
+    @property
+    def port_declaration(self) -> str:
+        return "avalon_mm_intf.agent avalon"
+
+    def signal(self, name:str) -> str:
+        return "avalon." + name
+
+    @property
+    def word_addr_width(self) -> int:
+        # Avalon agents use word addressing, therefore address width is reduced
+        return self.addr_width - clog2(self.data_width_bytes)
+
+class Avalon_Cpuif_flattened(Avalon_Cpuif):
+    @property
+    def port_declaration(self) -> str:
+        lines = [
+            "input wire " + self.signal("read"),
+            "input wire " + self.signal("write"),
+            "output logic " + self.signal("waitrequest"),
+            f"input wire [{self.word_addr_width-1}:0] " + self.signal("address"),
+            f"input wire [{self.data_width-1}:0] " + self.signal("writedata"),
+            f"input wire [{self.data_width_bytes-1}:0] " + self.signal("byteenable"),
+            "output logic " + self.signal("readdatavalid"),
+            "output logic " + self.signal("writeresponsevalid"),
+            f"output logic [{self.data_width-1}:0] " + self.signal("readdata"),
+            "output logic [1:0] " + self.signal("response"),
+        ]
+        return ",\n".join(lines)
+
+    def signal(self, name:str) -> str:
+        return "avalon_" + name
diff --git a/src/peakrdl_regblock/cpuif/avalon/avalon_tmpl.sv b/src/peakrdl_regblock/cpuif/avalon/avalon_tmpl.sv
new file mode 100644
index 0000000..be7e1d0
--- /dev/null
+++ b/src/peakrdl_regblock/cpuif/avalon/avalon_tmpl.sv
@@ -0,0 +1,29 @@
+// Request
+always_comb begin
+    cpuif_req = {{cpuif.signal("read")}} | {{cpuif.signal("write")}};
+    cpuif_req_is_wr = {{cpuif.signal("write")}};
+    {%- if cpuif.data_width_bytes == 1 %}
+    cpuif_addr = {{cpuif.signal("address")}};
+    {%- else %}
+    cpuif_addr = { {{-cpuif.signal("address")}}, {{clog2(cpuif.data_width_bytes)}}'b0};
+    {%- endif %}
+    cpuif_wr_data = {{cpuif.signal("writedata")}};
+    for(int i=0; i<{{cpuif.data_width_bytes}}; i++) begin
+        cpuif_wr_biten[i*8 +: 8] <= {8{ {{-cpuif.signal("byteenable")}}[i]}};
+    end
+    {{cpuif.signal("waitrequest")}} = (cpuif_req_stall_rd & {{cpuif.signal("read")}}) | (cpuif_req_stall_wr & {{cpuif.signal("write")}});
+end
+
+// Response
+always_comb begin
+    {{cpuif.signal("readdatavalid")}} = cpuif_rd_ack;
+    {{cpuif.signal("writeresponsevalid")}} = cpuif_wr_ack;
+    {{cpuif.signal("readdata")}} = cpuif_rd_data;
+    if(cpuif_rd_err || cpuif_wr_err) begin
+        // SLVERR
+        {{cpuif.signal("response")}} = 2'b10;
+    end else begin
+        // OK
+        {{cpuif.signal("response")}} = 2'b00;
+    end
+end
diff --git a/tests/lib/cpuifs/__init__.py b/tests/lib/cpuifs/__init__.py
index e69de29..6ea672d 100644
--- a/tests/lib/cpuifs/__init__.py
+++ b/tests/lib/cpuifs/__init__.py
@@ -0,0 +1,17 @@
+from .passthrough import Passthrough
+from .apb3 import APB3, FlatAPB3
+from .apb4 import APB4, FlatAPB4
+from .axi4lite import AXI4Lite, FlatAXI4Lite
+from .avalon import Avalon, FlatAvalon
+
+ALL_CPUIF = [
+    Passthrough(),
+    APB3(),
+    FlatAPB3(),
+    APB4(),
+    FlatAPB4(),
+    AXI4Lite(),
+    FlatAXI4Lite(),
+    Avalon(),
+    FlatAvalon(),
+]
diff --git a/tests/lib/cpuifs/apb4/apb4_intf_driver.sv b/tests/lib/cpuifs/apb4/apb4_intf_driver.sv
index d5ebe00..cf5258f 100644
--- a/tests/lib/cpuifs/apb4/apb4_intf_driver.sv
+++ b/tests/lib/cpuifs/apb4/apb4_intf_driver.sv
@@ -58,7 +58,7 @@ interface apb4_intf_driver #(
 
     semaphore txn_mutex = new(1);
 
-    task automatic write(logic [ADDR_WIDTH-1:0] addr, logic [DATA_WIDTH-1:0] data);
+    task automatic write(logic [ADDR_WIDTH-1:0] addr, logic [DATA_WIDTH-1:0] data, logic [DATA_WIDTH/8-1:0] strb = '1);
         txn_mutex.get();
         ##0;
 
@@ -69,7 +69,7 @@ interface apb4_intf_driver #(
         cb.PPROT <= '0;
         cb.PADDR <= addr;
         cb.PWDATA <= data;
-        cb.PSTRB <= '1;
+        cb.PSTRB <= strb;
         @(cb);
 
         // active phase
diff --git a/tests/lib/cpuifs/avalon/__init__.py b/tests/lib/cpuifs/avalon/__init__.py
new file mode 100644
index 0000000..79672ab
--- /dev/null
+++ b/tests/lib/cpuifs/avalon/__init__.py
@@ -0,0 +1,18 @@
+from ..base import CpuifTestMode
+
+from peakrdl_regblock.cpuif.avalon import Avalon_Cpuif, Avalon_Cpuif_flattened
+
+class Avalon(CpuifTestMode):
+    cpuif_cls = Avalon_Cpuif
+    rtl_files = [
+        "../../../../hdl-src/avalon_mm_intf.sv",
+    ]
+    tb_files = [
+        "../../../../hdl-src/avalon_mm_intf.sv",
+        "avalon_mm_intf_driver.sv",
+    ]
+    tb_template = "tb_inst.sv"
+
+class FlatAvalon(Avalon):
+    cpuif_cls = Avalon_Cpuif_flattened
+    rtl_files = []
diff --git a/tests/lib/cpuifs/avalon/avalon_mm_intf_driver.sv b/tests/lib/cpuifs/avalon/avalon_mm_intf_driver.sv
new file mode 100644
index 0000000..2c5480a
--- /dev/null
+++ b/tests/lib/cpuifs/avalon/avalon_mm_intf_driver.sv
@@ -0,0 +1,138 @@
+interface avalon_mm_intf_driver #(
+        parameter DATA_WIDTH = 32,
+        parameter ADDR_WIDTH = 32
+    )(
+        input wire clk,
+        input wire rst,
+        avalon_mm_intf.host avalon
+    );
+    localparam ADDR_PAD = $clog2(DATA_WIDTH/8);
+    localparam WORD_ADDR_WIDTH = ADDR_WIDTH - ADDR_PAD;
+
+    timeunit 1ps;
+    timeprecision 1ps;
+
+    logic av_read;
+    logic av_write;
+    logic av_waitrequest;
+    logic [WORD_ADDR_WIDTH-1:0] av_address;
+    logic [DATA_WIDTH-1:0] av_writedata;
+    logic [DATA_WIDTH/8-1:0] av_byteenable;
+    logic av_readdatavalid;
+    logic av_writeresponsevalid;
+    logic [DATA_WIDTH-1:0] av_readdata;
+    logic [1:0] av_response;
+
+    assign avalon.read = av_read;
+    assign avalon.write = av_write;
+    assign av_waitrequest = avalon.waitrequest;
+    assign avalon.address = av_address;
+    assign avalon.writedata = av_writedata;
+    assign avalon.byteenable = av_byteenable;
+    assign av_readdatavalid = avalon.readdatavalid;
+    assign av_writeresponsevalid = avalon.writeresponsevalid;
+    assign av_readdata = avalon.readdata;
+    assign av_response = avalon.response;
+
+    default clocking cb @(posedge clk);
+        default input #1step output #1;
+        output av_read;
+        output av_write;
+        input av_waitrequest;
+        output av_address;
+        output av_writedata;
+        output av_byteenable;
+        input av_readdatavalid;
+        input av_writeresponsevalid;
+        input av_readdata;
+        input av_response;
+    endclocking
+
+    task automatic reset();
+        cb.av_read <= '0;
+        cb.av_write <= '0;
+        cb.av_address <= '0;
+        cb.av_writedata <= '0;
+        cb.av_byteenable <= '0;
+    endtask
+
+    semaphore req_mutex = new(1);
+    semaphore resp_mutex = new(1);
+
+    task automatic write(logic [ADDR_WIDTH-1:0] addr, logic [DATA_WIDTH-1:0] data, logic [DATA_WIDTH/8-1:0] strb = '1);
+        fork
+            begin
+                req_mutex.get();
+                ##0;
+                // Initiate transfer
+                cb.av_write <= '1;
+                cb.av_address <= (addr >> ADDR_PAD);
+                cb.av_writedata <= data;
+                cb.av_byteenable <= strb;
+                @(cb);
+
+                // Wait for transfer to be accepted
+                while(cb.av_waitrequest == 1'b1) @(cb);
+                reset();
+                req_mutex.put();
+            end
+
+            begin
+                resp_mutex.get();
+                @cb;
+                // Wait for response
+                while(cb.av_writeresponsevalid !== 1'b1) @(cb);
+                assert(!$isunknown(cb.av_response)) else $error("Read from 0x%0x returned X's on av_response", addr);
+                resp_mutex.put();
+            end
+        join
+    endtask
+
+    task automatic read(logic [ADDR_WIDTH-1:0] addr, output logic [DATA_WIDTH-1:0] data);
+        fork
+            begin
+                req_mutex.get();
+                ##0;
+                // Initiate transfer
+                cb.av_read <= '1;
+                cb.av_address <= (addr >> ADDR_PAD);
+                @(cb);
+
+                // Wait for transfer to be accepted
+                while(cb.av_waitrequest == 1'b1) @(cb);
+                reset();
+                req_mutex.put();
+            end
+
+            begin
+                resp_mutex.get();
+                @cb;
+                // Wait for response
+                while(cb.av_readdatavalid !== 1'b1) @(cb);
+                assert(!$isunknown(cb.av_readdata)) else $error("Read from 0x%0x returned X's on av_response", av_readdata);
+                assert(!$isunknown(cb.av_response)) else $error("Read from 0x%0x returned X's on av_response", addr);
+                data = cb.av_readdata;
+                resp_mutex.put();
+            end
+        join
+    endtask
+
+    task automatic assert_read(logic [ADDR_WIDTH-1:0] addr, logic [DATA_WIDTH-1:0] expected_data, logic [DATA_WIDTH-1:0] mask = '1);
+        logic [DATA_WIDTH-1:0] data;
+        read(addr, data);
+        data &= mask;
+        assert(data == expected_data) else $error("Read from 0x%x returned 0x%x. Expected 0x%x", addr, data, expected_data);
+    endtask
+
+    initial begin
+        reset();
+    end
+
+    initial forever begin
+        @cb;
+        if(!rst) assert(!$isunknown(cb.av_waitrequest)) else $error("Saw X on av_waitrequest!");
+        if(!rst) assert(!$isunknown(cb.av_readdatavalid)) else $error("Saw X on av_readdatavalid!");
+        if(!rst) assert(!$isunknown(cb.av_writeresponsevalid)) else $error("Saw X on av_writeresponsevalid!");
+    end
+
+endinterface
diff --git a/tests/lib/cpuifs/avalon/tb_inst.sv b/tests/lib/cpuifs/avalon/tb_inst.sv
new file mode 100644
index 0000000..e5b2303
--- /dev/null
+++ b/tests/lib/cpuifs/avalon/tb_inst.sv
@@ -0,0 +1,36 @@
+{% sv_line_anchor %}
+avalon_mm_intf #(
+    .DATA_WIDTH({{exporter.cpuif.data_width}}),
+    .ADDR_WIDTH({{exporter.cpuif.word_addr_width}})
+) avalon();
+avalon_mm_intf_driver #(
+    .DATA_WIDTH({{exporter.cpuif.data_width}}),
+    .ADDR_WIDTH({{exporter.cpuif.addr_width}})
+) cpuif (
+    .clk(clk),
+    .rst(rst),
+    .avalon(avalon)
+);
+{% if type(cpuif).__name__.startswith("Flat") %}
+{% sv_line_anchor %}
+wire avalon_read;
+wire avalon_write;
+wire avalon_waitrequest;
+wire [{{exporter.cpuif.word_addr_width - 1}}:0] avalon_address;
+wire [{{exporter.cpuif.data_width - 1}}:0] avalon_writedata;
+wire [{{exporter.cpuif.data_width_bytes - 1}}:0] avalon_byteenable;
+wire avalon_readdatavalid;
+wire avalon_writeresponsevalid;
+wire [{{exporter.cpuif.data_width - 1}}:0] avalon_readdata;
+wire [1:0] avalon_response;
+assign avalon_read = avalon.read;
+assign avalon_write = avalon.write;
+assign avalon.waitrequest = avalon_waitrequest;
+assign avalon_address = avalon.address;
+assign avalon_writedata = avalon.writedata;
+assign avalon_byteenable = avalon.byteenable;
+assign avalon.readdatavalid = avalon_readdatavalid;
+assign avalon.writeresponsevalid = avalon_writeresponsevalid;
+assign avalon.readdata = avalon_readdata;
+assign avalon.response = avalon_response;
+{% endif %}
diff --git a/tests/lib/cpuifs/axi4lite/axi4lite_intf_driver.sv b/tests/lib/cpuifs/axi4lite/axi4lite_intf_driver.sv
index a05f4f5..b55aada 100644
--- a/tests/lib/cpuifs/axi4lite/axi4lite_intf_driver.sv
+++ b/tests/lib/cpuifs/axi4lite/axi4lite_intf_driver.sv
@@ -101,7 +101,7 @@ interface axi4lite_intf_driver #(
     semaphore txn_ar_mutex = new(1);
     semaphore txn_r_mutex = new(1);
 
-    task automatic write(logic [ADDR_WIDTH-1:0] addr, logic [DATA_WIDTH-1:0] data);
+    task automatic write(logic [ADDR_WIDTH-1:0] addr, logic [DATA_WIDTH-1:0] data, logic [DATA_WIDTH/8-1:0] strb = '1);
         bit w_before_aw;
         w_before_aw = $urandom_range(1,0);
 
@@ -125,7 +125,7 @@ interface axi4lite_intf_driver #(
                 if(!w_before_aw) repeat($urandom_range(2,0)) @cb;
                 cb.WVALID <= '1;
                 cb.WDATA <= data;
-                cb.WSTRB <= '1; // TODO: Support byte strobes
+                cb.WSTRB <= strb;
                 @(cb);
                 while(cb.WREADY !== 1'b1) @(cb);
                 cb.WVALID <= '0;
diff --git a/tests/lib/test_params.py b/tests/lib/test_params.py
index 8e2318b..3615561 100644
--- a/tests/lib/test_params.py
+++ b/tests/lib/test_params.py
@@ -1,32 +1,7 @@
 from itertools import product
 
-from .cpuifs.apb3 import APB3, FlatAPB3
-from .cpuifs.apb4 import APB4, FlatAPB4
-from .cpuifs.axi4lite import AXI4Lite, FlatAXI4Lite
-from .cpuifs.passthrough import Passthrough
-
-
-all_cpuif = [
-    APB3(),
-    FlatAPB3(),
-    APB4(),
-    FlatAPB4(),
-    AXI4Lite(),
-    FlatAXI4Lite(),
-    Passthrough(),
-]
-
 def get_permutations(spec):
     param_list = []
     for v in product(*spec.values()):
         param_list.append(dict(zip(spec, v)))
     return param_list
-
-#-------------------------------------------------------------------------------
-# TODO: this wont scale well. Create groups of permutations. not necessary to permute everything all the time.
-TEST_PARAMS = get_permutations({
-    "cpuif": all_cpuif,
-    "retime_read_fanin": [True, False],
-    "retime_read_response": [True, False],
-    "reuse_hwif_typedefs": [True, False],
-})
diff --git a/tests/test_external/testcase.py b/tests/test_external/testcase.py
index e5b3969..623ad67 100644
--- a/tests/test_external/testcase.py
+++ b/tests/test_external/testcase.py
@@ -6,7 +6,7 @@ from ..lib.cpuifs.apb4 import APB4
 from ..lib.cpuifs.axi4lite import AXI4Lite
 from ..lib.cpuifs.passthrough import Passthrough
 
-TEST_PARAMS = get_permutations({
+@parameterized_class(get_permutations({
     "cpuif": [
         APB4(),
         AXI4Lite(),
@@ -15,9 +15,7 @@ TEST_PARAMS = get_permutations({
     "retime_read_fanin": [True, False],
     "retime_read_response": [True, False],
     "retime_external": [True, False],
-})
-
-@parameterized_class(TEST_PARAMS)
+}))
 class Test(SimTestCase):
     extra_tb_files = [
         "../lib/external_reg.sv",
diff --git a/tests/test_pipelined_cpuif/testcase.py b/tests/test_pipelined_cpuif/testcase.py
index 422861b..27fe9ae 100644
--- a/tests/test_pipelined_cpuif/testcase.py
+++ b/tests/test_pipelined_cpuif/testcase.py
@@ -1,9 +1,14 @@
 from parameterized import parameterized_class
 
 from ..lib.sim_testcase import SimTestCase
-from ..lib.test_params import TEST_PARAMS
+from ..lib.test_params import get_permutations
+from ..lib.cpuifs import ALL_CPUIF
 
-@parameterized_class(TEST_PARAMS)
+@parameterized_class(get_permutations({
+    "cpuif": ALL_CPUIF,
+    "retime_read_fanin": [True, False],
+    "retime_read_response": [True, False],
+}))
 class Test(SimTestCase):
     def test_dut(self):
         self.run_test()
diff --git a/tests/test_structural_sw_rw/testcase.py b/tests/test_structural_sw_rw/testcase.py
index d6599a6..9c947c4 100644
--- a/tests/test_structural_sw_rw/testcase.py
+++ b/tests/test_structural_sw_rw/testcase.py
@@ -1,18 +1,37 @@
 import os
 
 from parameterized import parameterized_class
+import pytest
 
 from ..lib.sim_testcase import SimTestCase
 from ..lib.synth_testcase import SynthTestCase
-from ..lib.test_params import TEST_PARAMS, get_permutations
+from ..lib.test_params import get_permutations
+from ..lib.cpuifs import ALL_CPUIF
 from ..lib.simulators.xilinx import Xilinx
-import pytest
 
-@parameterized_class(TEST_PARAMS)
-class TestParameterizations(SimTestCase):
+
+
+
+@parameterized_class(get_permutations({
+    "cpuif": ALL_CPUIF,
+    "retime_read_fanin": [True, False],
+    "retime_read_response": [True, False],
+}))
+class TestCPUIFS(SimTestCase):
     def test_dut(self):
         self.run_test()
 
+
+
+@parameterized_class(get_permutations({
+    "reuse_hwif_typedefs": [True, False],
+}))
+class TestTypedefs(SimTestCase):
+    def test_dut(self):
+        self.run_test()
+
+
+
 @parameterized_class(get_permutations({
     "default_reset_activelow": [True, False],
     "default_reset_async": [True, False],
@@ -22,14 +41,26 @@ class TestDefaultResets(SimTestCase):
         self.run_test()
 
 
-@parameterized_class(TEST_PARAMS)
+
+@parameterized_class(get_permutations({
+    "cpuif": ALL_CPUIF,
+    "retime_read_fanin": [True, False],
+    "retime_read_response": [True, False],
+    "reuse_hwif_typedefs": [True, False],
+}))
 class TestSynth(SynthTestCase):
     def test_dut(self):
         self.run_synth()
 
 
+
 @pytest.mark.skipif(os.environ.get("STUB_SIMULATOR", False) or os.environ.get("NO_XSIM", False), reason="user skipped")
-@parameterized_class(TEST_PARAMS)
+@parameterized_class(get_permutations({
+    "cpuif": ALL_CPUIF,
+    "retime_read_fanin": [True, False],
+    "retime_read_response": [True, False],
+    "reuse_hwif_typedefs": [True, False],
+}))
 class TestVivado(SimTestCase):
     """
     Vivado XSIM's implementation of clocking blocks is broken, which is heavily used