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A digital circuit that literally "counts" - it progresses through a sequence of states that are representative of some value. It need not count in a natural progression, i.e., 1,2,3,4,5, etc., to be considered a counter (you can have different count sequences). Sometime it's sufficient that the counter counts to some value and then stops. Examples are Gray code, up/down counter.

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Why is my code output always showing 0?

This is a 4 bit counter code written using Verilog HDL on Quartus. Can somebody explain why is my output o always showing 0? …
Akib Ahmed Ishan's user avatar