packet valve. will drop incoming data if shut off.

1 files changed, 28 insertions, 0 deletions

diff --git a/usrp2/fifo/valve36.v b/usrp2/fifo/valve36.v
new file mode 100644
index 000000000..b4b23e5a6
--- /dev/null
+++ b/usrp2/fifo/valve36.v
@@ -0,0 +1,28 @@
+
+
+module valve36
+  (input clk, input reset, input clear,
+   input shutoff,
+   input [35:0] data_i, input src_rdy_i, output dst_rdy_o,
+   output [35:0] data_o, output src_rdy_o, input dst_rdy_i);
+   
+   reg 		 shutoff_int, active;
+   
+   assign data_o = data_i;
+
+   assign dst_rdy_o = shutoff_int ? 1'b1 : dst_rdy_i;
+   assign src_rdy_o = shutoff_int ? 1'b0 : src_rdy_i;
+   
+   always @(posedge clk)
+     if(reset | clear)
+       active <= 0;
+     else if(src_rdy_i & dst_rdy_o)
+       active <= ~data_i[33];
+   
+   always @(posedge clk)
+     if(reset | clear)
+       shutoff_int <= 0;
+     else if(~active)
+       shutoff_int <= shutoff;
+   
+endmodule // valve36