bslathi19/PeakRDL-BusDecoder
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Fix APB PREADY not asserted on invalid address decode errors (#40)

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Fix APB PREADY signal to assert during error conditions

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: arnavsacheti <36746504+arnavsacheti@users.noreply.github.com>
This commit is contained in:
Copilot
2026-02-02 23:34:09 -08:00
committed by GitHub
parent 2abf7cf7f2
commit 1e09da6dbf
12 changed files with 168 additions and 93 deletions
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30
src/peakrdl_busdecoder/cpuif/axi4lite/axi4_lite_cpuif_flat.py
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@@ -72,23 +72,33 @@ class AXI4LiteCpuifFlat(BaseCpuif):
return "\n".join(f"assign {lhs} = {rhs};" for lhs, rhs in fanout.items())
def fanin(self, node: AddressableNode | None = None) -> str:
def fanin_wr(self, node: AddressableNode | None = None, *, error: bool = False) -> str:
fanin: dict[str, str] = {}
if node is None:
fanin["cpuif_wr_ack"] = "'0"
fanin["cpuif_wr_err"] = "'0"
if error:
fanin["cpuif_wr_ack"] = "'1"
fanin["cpuif_wr_err"] = "cpuif_wr_sel.cpuif_err"
else:
# Read side: ack comes from RVALID; err if RRESP[1] is set (SLVERR/DECERR)
fanin["cpuif_wr_ack"] = self.signal("BVALID", node, "i")
fanin["cpuif_wr_err"] = f"{self.signal('BRESP', node, 'i')}[1]"
return "\n".join(f"{lhs} = {rhs};" for lhs, rhs in fanin.items())
def fanin_rd(self, node: AddressableNode | None = None, *, error: bool = False) -> str:
fanin: dict[str, str] = {}
if node is None:
fanin["cpuif_rd_ack"] = "'0"
fanin["cpuif_rd_err"] = "'0"
fanin["cpuif_rd_data"] = "'0"
if error:
fanin["cpuif_rd_ack"] = "'1"
fanin["cpuif_rd_err"] = "cpuif_rd_sel.cpuif_err"
else:
# Read side: ack comes from RVALID; err if RRESP[1] is set (SLVERR/DECERR)
fanin["cpuif_rd_ack"] = self.signal("RVALID", node, "i")
fanin["cpuif_rd_err"] = f"{self.signal('RRESP', node, 'i')}[1]"
return "\n".join(f"{lhs} = {rhs};" for lhs, rhs in fanin.items())
def readback(self, node: AddressableNode | None = None) -> str:
fanin: dict[str, str] = {}
if node is None:
fanin["cpuif_rd_data"] = "'0"
else:
fanin["cpuif_rd_data"] = self.signal("RDATA", node, "i")
return "\n".join(f"{lhs} = {rhs};" for lhs, rhs in fanin.items())