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Diffstat (limited to 'fpga/usrp2/sdr_lib/halfband_tb.v')
| -rw-r--r-- | fpga/usrp2/sdr_lib/halfband_tb.v | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/fpga/usrp2/sdr_lib/halfband_tb.v b/fpga/usrp2/sdr_lib/halfband_tb.v new file mode 100644 index 000000000..80f46fe36 --- /dev/null +++ b/fpga/usrp2/sdr_lib/halfband_tb.v @@ -0,0 +1,137 @@ +// +// Copyright 2011 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + +module halfband_tb( ) ; + + // Parameters for instantiation + parameter clocks = 2 ; // Number of clocks per input + parameter decim = 0 ; // 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 ; + + // Setup the clock + initial clock = 1'b0 ; + always #5 clock <= ~clock ; + + // Come out of reset after a while + initial reset = 1'b1 ; + initial #100 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 ) + ) ; + + integer i, ri, ro, infile, outfile ; + + // 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 |