Mehrdadghassabi / Monkey_Cpu

This is a simple CPU descripted in vhdl.

Monkey CPU

This is a simple CPU in harward design format.

Purpose

It's a university training project and the functionality that we want from this cpu is just multiplex two 3x3 matrix and save the result in registry and Ram(in the future!). This CPU just can add and multiply number and doesnt need any other command according to the project definition.

The whole definition of the project in Farsi is in this file.

Schema

ISA

The instruction are build based in this ISA and stored from Right To Left in the Rom(This must become backward in the next edit!!).

Type O is for I/O commands and type E is for executing commands.

Each $ represent two bit of register address. and the @ means four bit of RAM address.

d represnt 16bit of data. and each F means four dont-carry bit.

Type	Function	OPcode	...
E	add	00	$$$FFFFFF
E	mul	01	$$$FFFFFF
O	load	11	$FdFF
O	write	10	$@FFFFFF

Run

We provide the sample code in the mul.bin file that tells the cpu to calculate below expression:

255*1 + 5*1 + 100*1 + 0*200 + 0*46 + 0*200 + 100*-1 + -1*180 + -1*300 = -220

and load lines of this file to the ROM array.

Result in ISE simulation

In the TestBench every 40ns we send a clock and increase the Program Counter once.