MAC transmit seems to work now. The root cause of the problem was accidentally using the rx_clk in one stage of the fifos on the tx side.

1 files changed, 23 insertions, 10 deletions

diff --git a/control_lib/newfifo/fifo_2clock.v b/control_lib/newfifo/fifo_2clock.v
index 40c479db7..2ada39fb0 100644
--- a/control_lib/newfifo/fifo_2clock.v
+++ b/control_lib/newfifo/fifo_2clock.v
@@ -2,26 +2,39 @@
 // FIXME ignores the AWIDTH (fifo size) parameter
 
 module fifo_2clock
-  #(parameter WIDTH=32, SIZE=9)
+  #(parameter WIDTH=36, SIZE=6)
    (input wclk, input [WIDTH-1:0] datain, input src_rdy_i, output dst_rdy_o, output [15:0] space,
     input rclk, output [WIDTH-1:0] dataout, output src_rdy_o, input dst_rdy_i, output [15:0] occupied,
     input arst);
    
-   wire [SIZE-1:0] level_rclk, level_wclk;
-   wire 	   full, empty, write, read;
+   wire [SIZE:0] level_rclk, level_wclk; // xilinx adds an extra bit if you ask for accurate levels
+   wire 	 full, empty, write, read;
 
    assign dst_rdy_o  = ~full;
    assign src_rdy_o  = ~empty;
    assign write      = src_rdy_i & dst_rdy_o;
    assign read 	     = src_rdy_o & dst_rdy_i;
-   
-   fifo_xlnx_512x36_2clk mac_tx_fifo_2clk
-     (.rst(rst),
-      .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-      .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
 
-   assign occupied  = {{(16-SIZE){1'b0}},level_rclk};
-   assign space = ((1<<SIZE)-1)-level_wclk;
+   generate
+      if(SIZE==9)
+	fifo_xlnx_512x36_2clk mac_tx_fifo_2clk
+	      (.rst(rst),
+	       .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+	       .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+      else if(SIZE==11)
+	fifo_xlnx_2Kx36_2clk mac_tx_fifo_2clk
+	      (.rst(rst),
+	       .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+	       .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+      else if(SIZE==6)
+	fifo_xlnx_64x36_2clk mac_tx_fifo_2clk
+		   (.rst(rst),
+		    .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+		    .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+   endgenerate
+   
+   assign occupied  = {{(16-SIZE-1){1'b0}},level_rclk};
+   assign space     = ((1<<SIZE)+1)-level_wclk;
    
 endmodule // fifo_2clock