From 6a100b578cbb3dd07170cefb2a5aeb116f7740bf Mon Sep 17 00:00:00 2001
From: Erik Kooistra <kooistra@astron.nl>
Date: Wed, 15 Jul 2015 14:34:24 +0000
Subject: [PATCH] Explained g_link_status_check and g_pre_header_padding.
---
libraries/technology/eth_10g/tech_eth_10g.vhd | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/libraries/technology/eth_10g/tech_eth_10g.vhd b/libraries/technology/eth_10g/tech_eth_10g.vhd
index 0fa0119642..b8275ea41c 100644
--- a/libraries/technology/eth_10g/tech_eth_10g.vhd
+++ b/libraries/technology/eth_10g/tech_eth_10g.vhd
@@ -56,6 +56,23 @@
-- |
-- mac_mm
--
+--
+-- . g_link_status_check:
+-- A link fault eg. due to rx disconnect is detected by the link fault status:
+-- 0 = OK
+-- 1 = local fault
+-- 2 = remote fault
+--
+-- From google search:
+-- Link fault Operation
+-- 1) Device B detects loss of signal. Local fault is signaled by PHY of Device B to Device B.
+-- 2) Device B ceases transmission of MAC frames and transmits remote fault to Device A.
+-- 3) Device A receives remote fault from Device B.
+-- 4) Device A stops sending frames, continuously generates Idle.
+--
+-- . g_pre_header_padding:
+-- See tech_mac10g.vhd
+--
LIBRARY IEEE, common_lib, dp_lib, technology_lib, tech_mac_10g_lib;
USE IEEE.STD_LOGIC_1164.ALL;
@@ -73,7 +90,7 @@ ENTITY tech_eth_10g IS
g_sim : BOOLEAN := FALSE;
g_sim_level : NATURAL := 0; -- 0 = use IP; 1 = use fast serdes model
g_nof_channels : NATURAL := 1;
- g_link_status_check : STD_LOGIC_VECTOR(c_tech_mac_10g_link_status_w-1 DOWNTO 0) := "11";
+ g_link_status_check : STD_LOGIC_VECTOR(c_tech_mac_10g_link_status_w-1 DOWNTO 0) := "11"; -- check remote fault & check local fault
g_pre_header_padding : BOOLEAN := FALSE
);
PORT (
--
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