Initial Commit - Forked from PeakRDL-regblock @ a440cc19769069be831d267505da4f3789a26695

src/peakrdl_regblock/write_buffering/implementation_generator.py

@@ -0,0 +1,59 @@
+from typing import TYPE_CHECKING
+from collections import namedtuple
+
+from systemrdl.component import Reg
+from systemrdl.node import RegNode
+
+from ..forloop_generator import RDLForLoopGenerator
+
+if TYPE_CHECKING:
+    from . import WriteBuffering
+
+class WBufLogicGenerator(RDLForLoopGenerator):
+    i_type = "genvar"
+    def __init__(self, wbuf: 'WriteBuffering') -> None:
+        super().__init__()
+        self.wbuf = wbuf
+        self.exp = wbuf.exp
+        self.template = self.exp.jj_env.get_template(
+            "write_buffering/template.sv"
+        )
+
+    def enter_Reg(self, node: 'RegNode') -> None:
+        super().enter_Reg(node)
+        assert isinstance(node.inst, Reg)
+
+        if not node.get_property('buffer_writes'):
+            return
+
+        regwidth = node.get_property('regwidth')
+        accesswidth = node.get_property('accesswidth')
+        strb_prefix = self.exp.dereferencer.get_access_strobe(node, reduce_substrobes=False)
+        Segment = namedtuple("Segment", ["strobe", "bslice"])
+        segments = []
+        if accesswidth < regwidth:
+            n_subwords = regwidth // accesswidth
+            for i in range(n_subwords):
+                strobe = strb_prefix + f"[{i}]"
+                if node.inst.is_msb0_order:
+                    bslice = f"[{regwidth - (accesswidth * i) - 1}: {regwidth - (accesswidth * (i+1))}]"
+                else:
+                    bslice = f"[{(accesswidth * (i + 1)) - 1}:{accesswidth * i}]"
+                segments.append(Segment(strobe, bslice))
+        else:
+            segments.append(Segment(strb_prefix, ""))
+
+        trigger = node.get_property('wbuffer_trigger')
+        is_own_trigger = (isinstance(trigger, RegNode) and trigger == node)
+
+        context = {
+            'wbuf': self.wbuf,
+            'wbuf_prefix': self.wbuf.get_wbuf_prefix(node),
+            'segments': segments,
+            'node': node,
+            'cpuif': self.exp.cpuif,
+            'get_resetsignal': self.exp.dereferencer.get_resetsignal,
+            'get_always_ff_event': self.exp.dereferencer.get_always_ff_event,
+            'is_own_trigger': is_own_trigger,
+        }
+        self.add_content(self.template.render(context))