[Commit-gnuradio] r8473 - usrp2/trunk/fpga/sdr_lib

[matt]

Author: matt
Date: 2008-05-21 11:58:54 -0600 (Wed, 21 May 2008)
New Revision: 8473

Added:
   usrp2/trunk/fpga/sdr_lib/hb_dec_tb.v
Log:
testbench for halfband decimator


Added: usrp2/trunk/fpga/sdr_lib/hb_dec_tb.v
===================================================================
--- usrp2/trunk/fpga/sdr_lib/hb_dec_tb.v                                (rev 0)
+++ usrp2/trunk/fpga/sdr_lib/hb_dec_tb.v        2008-05-21 17:58:54 UTC (rev 
8473)
@@ -0,0 +1,140 @@
+module hb_dec_tb( ) ;
+   
+    // Parameters for instantiation
+    parameter               clocks  = 20 ; // Number of clocks per input
+    parameter               decim   = 1 ; // Sets the filter to decimate
+    parameter               rate    = 2 ; // Sets the decimation rate
+
+    reg                     clock ;
+    reg                     reset ;
+    reg                     enable ;
+    reg                     strobe_in ;
+    reg     signed  [17:0]  data_in ;
+    wire                    strobe_out ;
+    wire    signed  [17:0]  data_out ;
+
+   initial
+     begin
+       $dumpfile("hb_dec_tb.vcd");
+       $dumpvars(0,hb_dec_tb);
+     end
+   
+    // Setup the clock
+    initial clock = 1'b0 ;
+    always #5 clock <= ~clock ;
+
+    // Come out of reset after a while
+    initial reset = 1'b1 ;
+    initial #1000 reset = 1'b0 ;
+
+    // Enable the entire system
+    initial enable = 1'b1 ;
+
+    // Instantiate UUT
+   /*
+    halfband_ideal 
+      #(
+        .decim      ( decim         ),
+        .rate       ( rate          )
+      ) uut(
+        .clock      ( clock         ),
+        .reset      ( reset         ),
+        .enable     ( enable        ),
+        .strobe_in  ( strobe_in     ),
+        .data_in    ( data_in       ),
+        .strobe_out ( strobe_out    ),
+        .data_out   ( data_out      )
+      ) ;
+    */
+
+   
+   hb_dec #(.IWIDTH(18),.OWIDTH(18),.CWIDTH(18),.ACCWIDTH(20)) uut
+     (.clk(clock),.rst(reset),.bypass(0),.stb_in(strobe_in),.data_in(data_in),
+      .stb_out(strobe_out),.data_out(data_out) );
+   
+    integer i, ri, ro, infile, outfile ;
+
+   always @(posedge clock)
+     begin
+       if(strobe_out)
+         $display(data_out);
+     end
+   
+    // Setup file IO
+    initial begin
+        infile = $fopen("input.dat","r") ;
+        outfile = $fopen("output.dat","r") ;
+        $timeformat(-9, 2, " ns", 10) ;
+    end
+
+    reg                 endofsim ;
+    reg signed  [17:0]  compare ;
+    integer             noe ;
+    initial             noe = 0 ;
+
+    initial begin
+        // Initialize inputs
+        strobe_in <= 1'd0 ;
+        data_in <= 18'd0 ;
+
+        // Wait for reset to go away
+        @(negedge reset) #0 ;
+        
+        // While we're still simulating ...
+        while( !endofsim ) begin
+
+            // Write the input from the file or 0 if EOF...
+            @( posedge clock ) begin
+               //#1 ;
+                strobe_in <= 1'b1 ;
+                if( !$feof(infile) )
+                    ri = $fscanf( infile, "%d", data_in ) ;
+                else
+                    data_in <= 18'd0 ;
+            end
+
+            // Clocked in - set the strobe to 0 if the number of
+            // clocks per sample is greater than 1
+            if( clocks > 1 ) begin
+                @(posedge clock) begin
+                    strobe_in <= 1'b0  ;
+                end
+
+                // Wait for the specified number of cycles
+                for( i = 0 ; i < (clocks-2) ; i = i + 1 ) begin
+                    @(posedge clock) #1 ;
+                end
+            end
+        end
+
+        // Print out the number of errors that occured
+        if( noe )
+            $display( "FAILED: %d errors during simulation", noe ) ;
+        else
+            $display( "PASSED: Simulation successful" ) ;
+
+        $stop ;
+    end
+
+   // Output comparison of simulated values versus known good values
+   always @ (posedge clock) begin
+      if( reset )
+        endofsim <= 1'b0 ;
+      else begin
+         if( !$feof(outfile) ) begin
+            if( strobe_out ) begin
+               ro = $fscanf( outfile, "%d\n", compare ) ;
+               if( compare != data_out ) begin
+                  //$display( "%t: %d != %d", $realtime, data_out, compare ) ;
+                  noe = noe + 1 ;
+               end
+            end
+         end else begin
+            // Signal end of simulation when no more outputs
+            endofsim <= 1'b1 ;
+         end
+      end
+   end     
+
+endmodule // hb_dec_tb
+