From: whitequark <cz@m-labs.hk>
Date: Thu, 13 Dec 2018 02:43:22 +0000 (+0000)
Subject: fhdl.ir: make sure clocks and resets of used CDs appear as inputs.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f85008e5ed503e777d96a59f83a1cb5617e0e08a;p=nmigen.git

fhdl.ir: make sure clocks and resets of used CDs appear as inputs.
---

diff --git a/nmigen/fhdl/ir.py b/nmigen/fhdl/ir.py
index 2af5a52..8de3388 100644
--- a/nmigen/fhdl/ir.py
+++ b/nmigen/fhdl/ir.py
@@ -58,6 +58,11 @@ class Fragment:
 
         self_driven = union(s._lhs_signals() for s in self.statements)
         self_used   = union(s._rhs_signals() for s in self.statements)
+        for cd_name, _ in self.iter_sync():
+            cd = clock_domains[cd_name]
+            self_used.add(cd.clk)
+            if cd.reset is not None:
+                self_used.add(cd.reset)
 
         ins  = self_used - self_driven
         outs = ports & self_driven