Section 6.5 presents a design for the serial adder. Derive a similar circuit that functions as a

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Section 6.5 presents a design for the serial adder. Derive a similar circuit that functions as a serial subtractor which produces the difference of operands A and B.


Data From Section 6.5

We will now present another simple example that illustrates the complete design process. In Chapter 3 we discussed the addition of binary numbers in detail. We explained several schemes that can be used to add two n-bit numbers in parallel, ranging from carry-ripple to carry-lookahead adders. In these schemes the speed of the adder unit is an important design parameter. Fast adders are more complex and thus more expensive. If speed is not of great importance, then a cost-effective option is to use a serial adder, in which bits are added a pair at a time.

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