[SOLVED] How to manipulate signals within certain time period in testbench in modelsim?

nervecell_23 · Apr 28, 2014

For instance, I want to figure out how many times SignalA becomes active during 100ns and 200ns, instead of counting in the waveform, how to achieve it by HDL in the testbench?

I need to set up a counter first, then how to make it count only within a specified time period?

Thanks!

rca · Apr 28, 2014

used this rising of falling edge of your signal as clock to increment your counter.

- - - Updated - - -

in verilog you could used variable $now to know when you could enable your counter.

dave_59 · Apr 28, 2014

Assuming your timescale is 1 ns in Verilog

Code:

integer counter;
initial begin
           count = 0;
           fork
            #100 begin : counter
                       forever @(posedge SignalA) count = count + 1;
                    end
            #200 disable counter;
          join
          $display("SignalA went high %0d times", count);
        end

This would be slightly easier in SystemVerilog which ModelSim does support

Code:

int counter;
initial begin
           count = 0;
           fork
            #100ns forever @(posedge SignalA) count++;
            #200ns;
          join_any
          disable fork;
          $display("SignalA went high %0d times", count);
        end

[SOLVED] How to manipulate signals within certain time period in testbench in modelsim?

nervecell_23

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rca

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dave_59

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[SOLVED] How to manipulate signals within certain time period in testbench in modelsim?

nervecell_23

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rca

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