edge sync on done signals so we only fill/empty one buffer

1 files changed, 22 insertions, 0 deletions

diff --git a/usrp2/gpmc/edge_sync.v b/usrp2/gpmc/edge_sync.v
new file mode 100644
index 000000000..5d9417c08
--- /dev/null
+++ b/usrp2/gpmc/edge_sync.v
@@ -0,0 +1,22 @@
+
+
+module edge_sync
+  #(parameter POSEDGE = 1)
+   (input clk,
+    input rst,
+    input sig,
+    output trig);
+   
+   reg [1:0] delay;
+   
+   always @(posedge clk)
+     if(rst)
+       delay <= 2'b00;
+     else
+       delay <= {delay[0],sig};
+   
+   assign trig = POSEDGE ? (delay==2'b01) : (delay==2'b10);
+   
+endmodule // edge_sync
+
+