Merge branch 'udp'

1 files changed, 24 insertions, 0 deletions

diff --git a/fpga/usrp2/serdes/serdes_fc_tx.v b/fpga/usrp2/serdes/serdes_fc_tx.v
new file mode 100644
index 000000000..2fe967c8d
--- /dev/null
+++ b/fpga/usrp2/serdes/serdes_fc_tx.v
@@ -0,0 +1,24 @@
+
+
+module serdes_fc_tx
+  (input clk, input rst,
+   input xon_rcvd, input xoff_rcvd, output reg inhibit_tx);
+
+   // XOFF means stop sending, XON means start sending
+   // clock domain stuff happens elsewhere, everything here is on main clk
+
+   reg [15:0] state;
+   always @(posedge clk)
+     if(rst)
+       state <= 0;
+     else if(xoff_rcvd)
+       state <= 255;
+     else if(xon_rcvd)
+       state <= 0;
+     else if(state !=0)
+       state <= state - 1;
+
+   always @(posedge clk)
+     inhibit_tx <= (state != 0);
+   
+endmodule // serdes_fc_tx