Resolve L2SDP-837 "B"

Closes L2SDP-837

boards/uniboard2c/designs/unb2c_test/revisions/unb2c_test_1GbE_I/tb_unb2c_test_1GbE_I.vhd

@@ -28,11 +28,20 @@
 -- > run 1 us.
 --
 -- Or try some MM:
+-- > as 12
 -- > run -a (or run 100 us)
 -- On command line do:
 -- > python $UPE_GEAR/peripherals/util_system_info.py --gn 0 -n 0 -v 5 --sim
+-- > python $UPE_GEAR/peripherals/pi_diag_block_gen_reg.py --gn 0 -s ETH_0 --reg gapsize=199999000
 --
-
+-- To run BG eth_tester in simuation do:
+-- > run -a (or run 1 ms)
+-- > tc_unb2_test_eth_sim_start.sh
+-- > tc_unb2_test_eth_sim_stop.sh
+-- or use python script:
+-- . use -n 10000 packets/s to have 1 packet per BG sync interval of 100 us in sim
+-- > tc_unb2_test_eth.py --gn2 0 --stream 0 -n 10000 --dest loopback --range 1000,1001,1 --interval 100 --scheme tx --sim
+-- stop simulation.
 LIBRARY IEEE;
 USE IEEE.std_logic_1164.ALL;
 
@@ -57,6 +66,8 @@ BEGIN
   eth_clk(0) <= NOT eth_clk(0) AFTER 8 ns;
   eth_clk(1) <= NOT eth_clk(1) AFTER 8 ns;
 
+  pps <= NOT pps AFTER 80 ns;
+
   eth_sgin <= eth_sgout;  -- loopback eth0 and eth1
 
   u_unb2c_test_1GbE_I : ENTITY work.unb2c_test_1GbE_I
@@ -76,7 +87,6 @@ BEGIN
     ID           => "00000000",
     TESTIO       => OPEN,
 
-
     -- 1GbE Control Interface
     ETH_CLK      => eth_clk,
     ETH_SGIN     => eth_sgin,