From 12e363e05770ab5bdf9a76516edd4b33eb1296bd Mon Sep 17 00:00:00 2001
From: Eric Kooistra <kooistra@astron.nl>
Date: Wed, 24 Nov 2021 10:45:14 +0100
Subject: [PATCH] Explained 'red' signal level in Eth tx serial data.

---
 libraries/io/eth/src/vhdl/eth_statistics.vhd | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/io/eth/src/vhdl/eth_statistics.vhd b/libraries/io/eth/src/vhdl/eth_statistics.vhd
index 51f22e7599..0fb1ce7131 100644
--- a/libraries/io/eth/src/vhdl/eth_statistics.vhd
+++ b/libraries/io/eth/src/vhdl/eth_statistics.vhd
@@ -35,6 +35,8 @@
 --   simulation delta cycle.
 -- . The eth_serial_in becomes active /= '0' when the Tx Eth is actually
 --   sending data, so this depends on the application or tb stimuli.
+-- . The transceiver sim model use 'U' to signal eop in tx_serial_out, so
+--   this is why then 'red' signal level appears in Wave window.
 
 LIBRARY IEEE, common_lib, work, technology_lib, dp_lib, tech_tse_lib;
 USE IEEE.STD_LOGIC_1164.ALL;
-- 
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