Propose a scheme for the design of a 4-it arithmetic logic unit that will have the...

Question

Question

Propose a scheme for the design of a 4-it arithmetic logic unit that will have the following capabilities: A+B, A-B

Answer 1

Answer #1

scheme 1:

this scheme has 1 4 bit adder

one 4-bit subtractor

we take 1-bit select signal

when select signal is 1 then the output get the value of a+b

otherwise, it take the output from the subtractor as shown below:

another method:

scheme 2:

using just 1 adder and select signal

when select is 1 the adder gets the value of B as it is. giving a+b as output

when select is 0 then the value of B is given as 2's complement as (not of B+1)

giving us A-B using 2;s complement method

Answer 2

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