mips_sys

fix reading (1 cycle latency) from ethernet peripheral
Parent e898509
Stefan Schuermans

Stefan Schuermans commited on 2012-02-26 18:26:02
Showing 1 changed files, with 16 additions and 6 deletions.

io/eth/eth.vhd
View file @ 3189179
... ... 
@@ -134,20 +134,30 @@ BEGIN
134 134 
         );
135 135
136 136 
     -- so far only for testing
137 
-    p_rx_test: PROCESS (i_addr, i_wr_data, i_wr_en,
138 
-                        s_rx_fifo_rd_rdy, s_rx_fifo_rd_data)
137 
+    p_rx_test_wr: PROCESS (i_addr, i_wr_data, i_wr_en)
139 138 
     BEGIN
140 
-        o_rd_data       <= X"00000000";
141 139 
         s_rx_fifo_rd_en <= '0';
140 
+        IF i_addr = "01" THEN
141 
+            IF i_wr_en(0) = '1' THEN
142 
+                s_rx_fifo_rd_en <= '1';
143 
+            END IF;
144 
+        END IF;
145 
+    END PROCESS p_rx_test_wr;
146 
+
147 
+    -- so far only for testing
148 
+    p_rx_test_rd: PROCESS (rst, clk)
149 
+    BEGIN
150 
+        IF rst = '1' THEN
151 
+            o_rd_data       <= X"00000000";
152 
+        ELSIF rising_edge(clk) THEN
153 
+            o_rd_data       <= X"00000000";
142 154 
             IF i_addr = "00" THEN
143 155 
                 o_rd_data(0) <= s_rx_fifo_rd_rdy;
144 156 
             ELSIF i_addr = "01" THEN
145 157 
                 o_rd_data(7 DOWNTO 0) <= s_rx_fifo_rd_data;
146 
-            IF i_wr_en(0) = '1' THEN
147 
-                s_rx_fifo_rd_en <= '1';
148 158 
             END IF;
149 159 
         END IF;
150 
-    END PROCESS p_rx_test;
160 
+    END PROCESS p_rx_test_rd;
151 161
152 162 
     pin_o_txd   <= "0000";
153 163 
     pin_o_tx_en <= '0';
154 164