diff --git a/lib/emac/src/tb_emac_top_jb.vhd b/lib/emac/src/tb_emac_top_jb.vhd
index 5b2ce3e..bf6c9a2 100644
--- a/lib/emac/src/tb_emac_top_jb.vhd
+++ b/lib/emac/src/tb_emac_top_jb.vhd
@@ -514,6 +514,157 @@ STIMULUS: process
 
 	begin
 
+		-- 100 Mbps
+		wait for 6*MII_CLK_PERIOD;
+		RST <= '0';
+		wait for 60*CLK_PERIOD;
+		emac_rx_reset_100mbps;
+		emac_tx_reset_100mbps;
+		pktgen_gigabit	<= '0';
+		pktgen_fcs_en	<= '1';
+		wait for 60*CLK_PERIOD;
+		
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+ 		emac_alloc (1004);
+
+		for i in 1 to 1 loop
+			for j in 1 to 10 loop
+		 		emac_alloc (72);
+		 		emac_write (72);
+			end loop;
+			wait for 1 ms;
+		end loop;
+		
+		wait for 60*CLK_PERIOD;
+
+		wait until rising_edge(mii_tx_clk_board) and mii_tx_en = '0';
+		
+		loop_back_en	<= '1';
+		
+ 		emac_alloc (74);
+ 		emac_write (74);
+ 
+ 		emac_alloc (105);
+ 		emac_write (105);
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+ 		emac_alloc (103);
+ 		emac_write (103);
+
+		emac_read (0);
+		emac_free;
+
+ 		emac_alloc (71);
+ 		emac_write (71);
+ 
+		emac_read (0);
+		emac_free;
+
+ 		emac_alloc (82);
+ 		emac_write (82);
+
+ 		emac_alloc (86);
+ 		emac_write (86);
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+ 		emac_alloc (77);
+ 		emac_write (77);
+
+ 		emac_alloc (99);
+ 		emac_write (99);
+
+ 		emac_alloc (65);
+ 		emac_write (65);
+
+ 		emac_alloc (321);
+ 		emac_write (321);
+
+		emac_read (0);
+		emac_free;
+
+ 		emac_alloc (1111);
+ 		emac_write (1111);
+
+		emac_read (0);
+		emac_free;
+
+ 		emac_alloc (73);
+ 		emac_write (73);
+
+ 		emac_alloc (107);
+ 		emac_write (107);
+
+ 		emac_alloc (83);
+ 		emac_write (83);
+
+		emac_read (0);
+		emac_free;
+
+ 		emac_alloc (72);
+ 		emac_write (72);
+
+ 		emac_alloc (1003);
+ 		emac_write (1003);
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+		emac_read (0);
+		emac_free;
+
+		wait for 60*CLK_PERIOD;
+
+		loop_back_en	<= '0';
+		pktgen_en		<= '1';
+		pkt_count		<= 0;
+		for i in 1 to 500 loop
+			wait for 1 us;
+			emac_read (0);
+			emac_free;
+			pkt_count	<= pkt_count + 1;
+		end loop;
+		pktgen_en		<= '0';
+		emac_read (0);
+		emac_free;
+			
+
+		-- 1000 MBps
+		RST <= '1';
 		wait for 6*MII_CLK_PERIOD;
 		RST <= '0';
 		wait for 60*CLK_PERIOD;
@@ -661,7 +812,6 @@ STIMULUS: process
 		emac_read (0);
 		emac_free;
 			
-
 		wait; 
 	
 	end process;