From a6b440b5c9c4fb0472c01aec84961c3f1b40c954 Mon Sep 17 00:00:00 2001
From: Jannis Harder <me@jix.one>
Date: Tue, 28 Jun 2022 19:05:35 +0200
Subject: [PATCH] memory_map: avoid undriven unused FF inputs for -keepdc

---
 passes/memory/memory_map.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/passes/memory/memory_map.cc b/passes/memory/memory_map.cc
index 5ec717733..fd5b1f1ad 100644
--- a/passes/memory/memory_map.cc
+++ b/passes/memory/memory_map.cc
@@ -228,6 +228,9 @@ struct MemoryMapWorker
 
 				data_reg_out[idx] = w_out;
 				c->setPort(ID::Q, w_out);
+
+				if (mem.wr_ports.empty())
+					module->connect(RTLIL::SigSig(w_in, w_out));
 			}
 		}