Question

Design a four bit simple Arithmetic and Logic Unit for 4-bit processor, which can perform the operations like – Addition (ADD), Subtraction (SUB), transfer (MOV), increment (INC), decrement (DEC), addition with carry (ADC), subtraction with borrow (SBB), logic NAND and logic NOR (NOR).

Arithmetic and Logic Units consist of the following circuits:

1) Arithmetic circuit – all the above specified arithmetic operations can be performed using four 4:1 Multiplexer and four Full Adder circuit.

2) Logic unit – logical operations – NAND, NOR are implemented for four bit inputs.​

Answer 1

This might help you with some of them

sorry if I misunderstood