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

Original-commit: 0df4b801a34697f2058b4a7b95e08d2a0576c9db
2013-10-10 10:17:27 -07:00
commit c91b74de33
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+//
+//  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