Refer to wrap bits instead of previous greycode in FIFO greycode calculation.

1 files changed, 2 insertions, 2 deletions

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;