Simple processor using VHDL

Design

The project follows this design:

with a few modifications:

• instruction format is IIXXYY (instruction number, register XX, register YY)
• there are only 4 general-purpose registers

Instructions

This processor implementation can interpret 4 different instructions:

• move (00XXYY) - move the value of a register YY to XX
• move in (01XXYY) - move the value of the input to the register XX
• add (10XXYY) - add the value of register YY to XX and store in XX
• sub (11XXYY) - subtract the value of register YY from XX and store in XX

Contents of the repository

• file 'test_cpu.circ' contains implementation of the processor in logisim
• folder 'proc' contains the processor component in a quartus project (including VHDL file)
• folder 'fpgaproc' contains the implementation designed to work on Altera Cyclone II FPGA