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16bit addition/subtraction with an 8bit adder 
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#1
May1312, 05:37 PM

P: 4

1. The problem statement, all variables and given/known data
Suppose we have only one 8bit ripple carry adder but need to do 16bit addition and subtraction. Design a sequential circuit (FSM) with only one 8bit ripple carry adder to implement a 16bit addersubtractor. You are allowed to use MUXs and need to generate the overﬂow signal. 2. Relevant equations
3. The attempt at a solution I've attempted to find similar circuit schematics, boolean expressions, diagrams, etc. online to no avail. I am familiar with the implementation with an 8bit ripple carry adder, and can obtain the final overflow signal through
I'm looking for guidance on where to begin. I think once I have the general idea on how 16 bits can be stuck in the 8 bit adder, I'll be able to do this problem. Specifically, where should I route the overflow to, and what combination of bits from the two original numbers should I put into the adder? Thanks for your time, Chris 


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