Please help me making tesbench about this? I badly needed Thanks :)

Count Zeros wrote: > Please help me making tesbench about this? Helping means: you start something, you encounter aspecificproblem, then you post what you have and then someone may help you fixing thatproblem. It does not mean: doingyourhomework. A testbench is fairly easy here: Do this in an (endless) loop: 1. generate a random binary number 2. calculate the count of zeros in that number in your way 3. pass the random number to the count_zeros module 4. compare your result with that from the count_zeros module 5. halt the simulation and raise an error if count_zero reports an error 6. halt the simulation and raise an error if the results are different 7. goto 1. Thats all.

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Edited by Moderator

Sorry sir Is this correct? module countzeros_tb(); reg [7:0] in; reg [7:0] x; wire [3:0] out; Or i will remove the x? Im not familiar with the function legal. and i can't find related topic about count zeros.

Dennis B. wrote: > Im not familiar with the function legal. It looks much alike you must write this function (which obviously checks the input value for validity) on your own. > and i can't find related topic about count zeros. Use that grey thing between your ears... Given a (binary) input vector of 10101010 tell me: how many 0 (= zeros) do you see in it? If your answer is 4, then: congratulation, you know how to count zeros! Now you simply must write that way of calculation down in Verilog.

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Edited by Moderator