Exams/ece241 2014 q1c

From HDLBits

Assume that you have two 8-bit 2's complement numbers, a[7:0] and b[7:0]. These numbers are added to produce s[7:0]. Also compute whether a (signed) overflow has occurred.

Module Declaration

module top_module (
    input [7:0] a,
    input [7:0] b,
    output [7:0] s,
    output overflow
    // assign s = ...
    // assign overflow = ...

A signed overflow occurs when adding two positive numbers produces a negative result, or adding two negative numbers produces a positive result. There are several methods to detect overflow: It could be computed by comparing the signs of the input and output numbers, or derived from the carry-out of bit n and n-1.

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