From 150d5ad04eec481c41f5a400948adc73f02becd5 Mon Sep 17 00:00:00 2001
From: Alex Forencich <alex@alexforencich.com>
Date: Wed, 24 Nov 2021 14:58:16 -0800
Subject: [PATCH] Handle out-of-range select as drop

---
 rtl/axis_demux.v | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rtl/axis_demux.v b/rtl/axis_demux.v
index 50b63359..fbfc748d 100644
--- a/rtl/axis_demux.v
+++ b/rtl/axis_demux.v
@@ -132,7 +132,7 @@ always @* begin
     if (!frame_reg && s_axis_tvalid && s_axis_tready) begin
         // start of frame, grab select value
         select_ctl = select;
-        drop_ctl = drop;
+        drop_ctl = drop || select >= M_COUNT;
         frame_ctl = 1'b1;
         if (!(s_axis_tready && s_axis_tvalid && s_axis_tlast)) begin
             select_next = select_ctl;