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Papabravo said:I don't think the subtractor is using two's complement, it looks more like one's complement. The way ones complement arithmetic works is to do an end around carry(borrow). I see the Flip-Flop for holding the carry state but I don't know if the end around carry happens on step four or if there is an extra step. I also don't know what the inputs to the subtractor are after four steps.