From 6ffe43a8ccee6f3e2d6fda5062901f16c54ddaad Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Mon, 31 Oct 2022 19:26:35 -0700
Subject: Level-trigger on TTO_FLAG instead of edge-trigger.

---
 isa/decode.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'isa/decode.cpp')

diff --git a/isa/decode.cpp b/isa/decode.cpp
index c11679c..1496364 100644
--- a/isa/decode.cpp
+++ b/isa/decode.cpp
@@ -185,7 +185,7 @@ instruction_context decode(unsigned int dfifb, unsigned int pc, unsigned int bit
                             inst.read_ctlreg = TT_BITS;
                             inst.write_ctlreg = TT_BITS;
                             inst.ef = [](auto &ctx) {
-                                ctx.ctlval.value() |= TTO_FLAG | TTO_FLAG_OLD;
+                                ctx.ctlval.value() |= TTO_FLAG;
                             };
                             break;
                         case 1:
@@ -202,7 +202,7 @@ instruction_context decode(unsigned int dfifb, unsigned int pc, unsigned int bit
                             inst.read_ctlreg = TT_BITS;
                             inst.write_ctlreg = TT_BITS;
                             inst.ef = [](auto &ctx) {
-                                ctx.ctlval.value() &= ~TTO_FLAG & ~TTO_FLAG_OLD;
+                                ctx.ctlval.value() &= ~TTO_FLAG;
                             };
                             break;
                         case 4:
@@ -235,7 +235,7 @@ instruction_context decode(unsigned int dfifb, unsigned int pc, unsigned int bit
                             inst.ef = [](auto &ctx) {
                                 auto &x = ctx.ctlval.value();
                                 auto chr = ctx.acc.value();
-                                x &= ~TTO_FLAG & ~TTO_FLAG_OLD & ~TTO_DATA;
+                                x &= ~TTO_FLAG & ~TTO_DATA;
                                 x |= (chr << TTO_DATA_SHIFT) & TTO_DATA;
                                 x |= TTO_TX;
                             };
-- 
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