diff --git a/lib/emac/src/tb_emac_top_jb.vhd b/lib/emac/src/tb_emac_top_jb.vhd
index 39fd0e5..9c16a8b 100644
--- a/lib/emac/src/tb_emac_top_jb.vhd
+++ b/lib/emac/src/tb_emac_top_jb.vhd
@@ -67,10 +67,16 @@ ARCHITECTURE behavior OF tb_emac_top_jb IS
 	signal mii_gtx_clk		: std_logic;
 
 	signal loop_back_en		: std_logic := '0';
+	
+	signal pktgen_tx		: unsigned(7 downto 0);
+	signal pktgen_tx_en		: std_logic;
+	signal pktgen_tx_er		: std_logic;
+	signal pktgen_rst		: std_logic := '1';
 
 	signal dat_o_cnt_en		: std_logic := '0';
 	signal dat_o_cnt_rst	: std_logic := '1';
 	signal dat_o_cnt		: natural;
+	signal pkt_count		: natural;
 	
 	type emac_action_t is (emac_idle, emac_alloc, emac_wait_alloc, emac_write, emac_wait_data, emac_read, emac_free);
 	signal emac_action	: emac_action_t;
@@ -113,6 +119,28 @@ inst_emac_top_jb : entity work.emac_top_jb
 		
 	);
 
+inst_pkt_gen : entity work.pkt_gen
+	GENERIC MAP
+	(
+		f_sysclk		=> 100.0,
+		PKT_DLY_MIN		=> 1.0E-6,
+		PKT_DLY_MAX		=> 10.0E-6,
+		PKT_SIZE_MIN	=> 64,
+		PKT_SIZE_MAX	=> 512
+		
+	)
+	PORT MAP
+	(
+		clk			=> CLK,
+		rst			=> pktgen_rst,
+		mii_tx_clk	=> mii_tx_clk_board,
+		mii_tx_en	=> pktgen_tx_en,
+		mii_tx_er	=> pktgen_tx_er,
+		mii_tx		=> pktgen_tx
+		
+	);
+
+
 CLK_GEN: process
 	begin
 		wait for CLK_PERIOD/2;
@@ -151,9 +179,9 @@ DAT_O_count_register:
 		end if;
 	end process;
 
-	mii_rx		<= mii_tx when loop_back_en = '1' else (others => 'Z');
-	mii_rx_dv	<= mii_tx_en when loop_back_en = '1' else '0';
-	mii_rx_er	<= mii_tx_er when loop_back_en = '1' else '0';
+	mii_rx		<= mii_tx when loop_back_en = '1' else pktgen_tx;
+	mii_rx_dv	<= mii_tx_en when loop_back_en = '1' else pktgen_tx_en;
+	mii_rx_er	<= mii_tx_er when loop_back_en = '1' else pktgen_tx_er;
 	mii_crs		<= '0';
 	mii_col		<= '0';
 	
@@ -447,79 +475,22 @@ STIMULUS: process
 		emac_read (0);
 		emac_free;
 
---  		emac_alloc (1536);
---  		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
---  
---  		emac_alloc (1536);
---  		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
--- 
---  		emac_alloc (1536);
---  		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
--- 
---  		emac_alloc (1536);
---  		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
--- 
---  		emac_alloc (1536);
---  		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
--- 
---  		emac_alloc (1536);
---  		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
--- 
---  		emac_alloc (1536);
---  		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
--- 
--- 		emac_alloc (64);
--- 		emac_write (64);
--- 		emac_read (0);
--- 		emac_free;
--- 
--- 		emac_alloc (512);
--- 		emac_write (512);
--- 		emac_read (0);
--- 		emac_free;
--- 
--- 		emac_alloc (1536);
--- 		emac_write (1536);
--- 		emac_read (0);
--- 		emac_free;
--- 
--- 		emac_alloc (65);
--- 		emac_write (65);
--- 		emac_read (0);
--- 		emac_free;
--- 
--- 		emac_alloc (66);
--- 		emac_write (66);
--- 		emac_read (0);
--- 		emac_free;
--- 
--- 		emac_alloc (67);
--- 		emac_write (67);
--- 		emac_read (0);
--- 		emac_free;
--- 
--- 		emac_alloc (512);
--- 		emac_write (64);
--- 
--- 		emac_alloc (128);
--- 		emac_write (128);
--- 		emac_read (0);
--- 		emac_free;
-		
+		wait for 6000*CLK_PERIOD;
+
+		loop_back_en	<= '0';
+		pktgen_rst		<= '0';
+		pkt_count		<= 0;
+		for i in 1 to 100 loop
+			wait for 100000*CLK_PERIOD;
+			emac_read (0);
+			emac_free;
+			pkt_count	<= pkt_count + 1;
+		end loop;
+		pktgen_rst		<= '1';
+		emac_read (0);
+		emac_free;
+			
+
 		wait; 
 	
 	end process;