4 Bit Subtractor Circuit. Logic design project cse111 4 bit adder subtractor circuitname. A 4 bit parallel subtractor is used to subtract a number consisting of 4 bits.
This circuit requires prerequisite knowledge of exor gate binary addition and subtraction full adder. For an n bit parallel subtractor we cascade n full subtractors to achieve the desired output. We get a 4 bit parallel subtractor by cascading a series of full subtractors.
We already know that two numbers a minuend and b subtrahend can be subtracted using 2s complement method where a b a 2s complement of b a 1s complement of b 1 thus 4 bit binary numbers a and b can subtract as and the logic circuit for the same can be drawn as.
Fourbitserialaddersubtractorsimulation vhw is a vhdl file needed to simulate the circuit behavior. This circuit requires prerequisite knowledge of exor gate binary addition and subtraction full adder. We already know that two numbers a minuend and b subtrahend can be subtracted using 2s complement method where a b a 2s complement of b a 1s complement of b 1 thus 4 bit binary numbers a and b can subtract as and the logic circuit for the same can be drawn as. You may also create a test bench waveform to simulate the circuit behavior instead.
