Explained g_link_status_check and g_pre_header_padding.

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 (