- bugfix: interframe gap counter was not effective

Committed on the Free edition of March Hare Software CVSNT Server.
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git-svn-id: http://moon:8086/svn/vhdl/trunk@875 cc03376c-175c-47c8-b038-4cd826a8556b

lib/emac/src/emac_tx.vhd

@@ -413,7 +413,6 @@ interframe_gap_counter:
 			ifg_idle	<= '0';
 			if reset_en = '1' or piso32_dout_vld = '1' then
 				ifg_cnt 	<= ifg_cnt_t'high;
-				ifg_idle	<= '1';
 			elsif ifg_cnt /= 0 then
 				ifg_cnt		<= ifg_cnt - 1;
 			else
@@ -494,13 +493,15 @@ xfer_state:
 			xfer_sn 		<= xfer_idle;
 			
 		when xfer_idle =>
-			if cmd_fifo_empty = '0' and piso32_din_rdy = '1' then
+			if cmd_fifo_empty = '0' then
 				xfer_sn 		<= xfer_start;
 			end if;
 			
 		when xfer_start =>
 			xfer_set		<= '1';
-			xfer_sn 		<= xfer_preamble0;
+			if cmd_fifo_empty = '0' and ifg_idle = '1' then
+				xfer_sn 		<= xfer_preamble0;
+			end if;
 
 		when xfer_preamble0 =>
 			preamble_addr	<= 0;
@@ -523,8 +524,6 @@ xfer_state:
 			piso32_din_vld	<= xfer_bsy;
 			xfer_en			<= '1';
 			if xfer_bsy = '0' then
- 				uncommit_en		<= '1';
-				xfer_free_en	<= '1';
 				xfer_sn 		<= xfer_crc;
 			end if;
 
@@ -537,9 +536,9 @@ xfer_state:
 			end if;
 
 		when xfer_finish =>
-			if ifg_idle = '0' then
-				xfer_sn		<= xfer_idle;
-			end if;
+			uncommit_en		<= '1';
+			xfer_free_en	<= '1';
+			xfer_sn		<= xfer_idle;
 
 		when others => 
 			xfer_sn		<= xfer_idle;