Question

Use VHDL to design a 4-bit ALU (Arithmetic logic Unit) with the 8 instructions: ADD, REVERSE, MUL, INC, XNOR, NOT, RROTATION, LROTATION. 1-Assume codes for instructions are: 000=ADD, 001=REVERSE, 010=MUL, 011=INC, 100=XNOR, 101=NOT, 110=RROTATION, and 111=LROTATION. 2-Assume input numbers are unsigned. 3-For instructions REVERSE, NOT, RROTATION, and LROTATION use number A3A2A1A0. 4-For addition result will be in C3C2C1C0 and carry out CO. 5- For multiplication use repeated addition such as A+A+A+... ( B times) and outputs are in D3D2D1D0, C3C2C1C0. 6-Inputs are clock, A3A2A1A0,B3B2B1B0, and code for instruction. Output is C3C2C1C0 and CO in case of add and D3D2D1D0, C3C2C1C0 in case of multiplication.

Answer 1