From f2964c280c53cf8305c3b82a69b8648ae008d6c8 Mon Sep 17 00:00:00 2001
From: Sebastian Bugge <vkbugge@hotmail.com>
Date: Fri, 18 Oct 2024 07:07:29 +0200
Subject: [PATCH] Properly parse NOP.

---
 src/main/scala/Decoder.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/Decoder.scala b/src/main/scala/Decoder.scala
index 3f6dc46..5ff90cb 100644
--- a/src/main/scala/Decoder.scala
+++ b/src/main/scala/Decoder.scala
@@ -98,7 +98,7 @@ class Decoder() extends Module {
     NOP,
     opcodeMap)
 
-  io.controlSignals.regWrite   := decodedControlSignals(0)
+  io.controlSignals.regWrite   := Mux(io.instruction.asUInt() === 19.U, false.B, decodedControlSignals(0)) // NOP
   io.controlSignals.memRead    := decodedControlSignals(1)
   io.controlSignals.memWrite   := decodedControlSignals(2)
   io.controlSignals.branch     := decodedControlSignals(3)