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module small_hb_int_tb( ) ;
// Parameters for instantiation
parameter clocks = 8'd1 ; // Number of clocks per output
parameter decim = 1 ; // Sets the filter to decimate
parameter rate = 2 ; // Sets the decimation rate
reg clock ;
reg reset ;
reg enable ;
wire strobe_in ;
reg signed [17:0] data_in ;
wire strobe_out ;
wire signed [17:0] data_out ;
initial
begin
$dumpfile("small_hb_int_tb.vcd");
$dumpvars(0,small_hb_int_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 ;
always @(posedge clock)
enable <= ~reset;
// 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 )
) ;
*/
cic_strober #(.WIDTH(8))
out_strober(.clock(clock),.reset(reset),.enable(enable),.rate(clocks),
.strobe_fast(1),.strobe_slow(strobe_out) );
cic_strober #(.WIDTH(8))
in_strober(.clock(clock),.reset(reset),.enable(enable),.rate(2),
.strobe_fast(strobe_out),.strobe_slow(strobe_in) );
small_hb_int #(.WIDTH(18)) uut
(.clk(clock),.rst(reset),.bypass(0),.stb_in(strobe_in),.data_in(data_in),
.stb_out(strobe_out),.output_rate(clocks),.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") ;
$timeformat(-9, 2, " ns", 10) ;
end
reg endofsim ;
reg signed [17:0] compare ;
integer noe ;
initial noe = 0 ;
initial begin
// Initialize inputs
data_in <= 18'd0 ;
// Wait for reset to go away
@(negedge reset) #0 ;
// While we're still simulating ...
while( !endofsim ) begin
// Write the input from the file or 0 if EOF...
@( negedge clock ) begin
if(strobe_in)
if( !$feof(infile) )
ri <= #1 $fscanf( infile, "%d", data_in ) ;
else
data_in <= 18'd0 ;
end
end
// Print out the number of errors that occured
if( noe )
$display( "FAILED: %d errors during simulation", noe ) ;
else
$display( "PASSED: Simulation successful" ) ;
$finish ;
end
// Output comparison of simulated values versus known good values
always @ (posedge clock) begin
if( reset )
endofsim <= 1'b0 ;
else begin
if( !$feof(outfile) ) begin
if( strobe_out ) begin
ro = $fscanf( outfile, "%d\n", compare ) ;
if( compare != data_out ) begin
//$display( "%t: %d != %d", $realtime, data_out, compare ) ;
noe = noe + 1 ;
end
end
end else begin
// Signal end of simulation when no more outputs
if($feof(infile))
endofsim <= 1'b1 ;
end
end
end
endmodule // small_hb_int_tb
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