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  1. module who_changed_first(input a, b, start); always @(posedge start) begin byte changed; WATCHERS: fork @a changed = "a"; @b changed = "b"; join_any disable WATCHERS; //< prevent others from overwriting case (changed) "a": work_1; "b": work_2; endcase end Assumes SystemVerilog. If Verilog you will need to add . See https://edaplayground.com/x/2NXz for example code.
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