Squashed B200 FPGA Source. Code from Josh Blum, Ian Buckley, and Matt Ettus.

1 files changed, 33 insertions, 0 deletions

diff --git a/fpga/usrp3/lib/dsp/cic_strober.v b/fpga/usrp3/lib/dsp/cic_strober.v
new file mode 100644
index 000000000..269b85f75
--- /dev/null
+++ b/fpga/usrp3/lib/dsp/cic_strober.v
@@ -0,0 +1,33 @@
+//
+//  USRP2 - Universal Software Radio Peripheral Mk II
+//
+//  Copyright (C) 2008 Matt Ettus
+//
+
+//
+
+module cic_strober
+  #(parameter WIDTH=8)
+    ( input clock,
+      input reset,
+      input enable,
+      input [WIDTH-1:0] rate, // Rate should EQUAL to your desired divide ratio, no more -1 BS
+      input strobe_fast,
+      output wire strobe_slow );
+   
+   reg [WIDTH-1:0] counter;
+   wire      now = (counter==1);
+   assign    strobe_slow = now && enable && strobe_fast;
+   
+   always @(posedge clock)
+     if(reset)
+       counter <= 0; 
+     else if (~enable)
+       counter <= rate;
+     else if(strobe_fast)
+       if(now)
+	 counter <= rate;
+       else 
+	 counter <= counter - 1;
+   
+endmodule // cic_strober