From 3ea86730def6bd637598c0cd0de9c772246b29d3 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sun, 17 Apr 2022 16:13:26 -0700
Subject: Refer to wrap bits instead of previous greycode in FIFO greycode
 calculation.

---
 hdl/fifo.sv | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'hdl')

diff --git a/hdl/fifo.sv b/hdl/fifo.sv
index 374f051..19877c4 100644
--- a/hdl/fifo.sv
+++ b/hdl/fifo.sv
@@ -41,7 +41,7 @@ module fifo
                     ++youngest_wrap;
             end
 
-            youngest_grey = {youngest_wrap, youngest} ^ ({youngest_grey, youngest} >> 1);
+            youngest_grey = {youngest_wrap, youngest} ^ ({youngest_wrap, youngest} >> 1);
 
             in_ready = oldest_plus_one_wrap_grey != youngest_grey;
         end
@@ -60,7 +60,7 @@ module fifo
                     ++oldest_wrap;
             end
 
-            oldest_grey = {oldest_grey, oldest} ^ ({oldest_grey, oldest} >> 1);
+            oldest_grey = {oldest_wrap, oldest} ^ ({oldest_wrap, oldest} >> 1);
             oldest_plus_one_wrap_grey = {!oldest_wrap, oldest} ^ ({!oldest_wrap, oldest} >> 1);
 
             out_valid = oldest_grey != youngest_grey;
-- 
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