- added FCS generation enable

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git-svn-id: http://moon:8086/svn/vhdl/trunk@894 cc03376c-175c-47c8-b038-4cd826a8556b

lib/emac/src/emac_tx.vhd

@@ -102,6 +102,7 @@ ARCHITECTURE behavior OF emac_tx IS
 	
 	signal reset_pipe		: unsigned(31 downto 0);
 	signal Gbps_en			: std_logic;
+	signal fcs_gen_en		: std_logic;
 	
 	signal fcs_inject_en	: std_logic;
 	signal fcs_rst			: std_logic;
@@ -377,6 +378,7 @@ host2xfer_sync_register:
 	begin
 		if rising_edge(mii_tx_clk) then
 			Gbps_en			<= ctrl_in.Gbps_en;
+			fcs_gen_en		<= ctrl_in.fcs_gen_en;
 		end if;	
 	end process;	
 
@@ -492,7 +494,7 @@ xfer_state_next:
 	end process;	
 
 xfer_state:
-	process(xfer_s, ifg_idle, cmd_fifo_empty, piso32_din_rdy, piso32_dout_vld, xfer_bsy)
+	process(xfer_s, ifg_idle, cmd_fifo_empty, piso32_din_rdy, piso32_dout_vld, xfer_bsy, fcs_gen_en)
 	begin
 		
 		piso32_din_vld		<= '0';
@@ -550,7 +552,10 @@ xfer_state:
 
 		when xfer_stop =>
 			if piso32_dout_vld = '0' then
-				xfer_sn 		<= xfer_crc;
+				xfer_sn 		<= xfer_finish;
+				if fcs_gen_en = '1' then
+					xfer_sn 		<= xfer_crc;
+				end if;
 			end if;
 
 		when xfer_crc =>
@@ -651,6 +656,10 @@ fcs_enable_gen:
 	fcs_din_vld	<= fcs_en(fcs_en'left) and piso32_dout_vld and piso32_dout_en;
 	
 inst_fcs: entity work.crc32
+	GENERIC MAP
+	(
+		crc32_init		=> X"00000000"
+	)
 	PORT MAP
 	(
 		rst				=> fcs_rst,