README

Specifications for Instruction memory (BRAM module)

Name	Instruction_Memory
Memory Type	Single Port ROM
32-Bit Addressing	Enabled
Write Width	32 bits
Write Depth	1024
Enable	Always Enabled
COE File	instructions.coe

Specifications for Data memory (BRAM module)

Name	Data_Memory
Memory Type	Single Port RAM
32-Bit Addressing	Disabled
Write Width	32 bits
Write Depth	1024
Enable	Use ENA pin
COE File	data.coe

Running the Simulation

Once the “instructions.coe” and “data.coe” are loaded into the instruction memory, you should simulate “test_CPU.v”. The simulation would not have completed within 1,000,000 ps. So in the console, please enter “run 1000 ns”.

You can tell the simulation is done when the instruction printed in the console is NOP (“00000000000000000000000000000000”). To check the result, hover over the Memory tab, on the left panel. Select Data_Memory. Change Value Radix to Decimal. It should be like the following.

The arguments to the program are stored in the first two memory slots in the Data Memory (loaded with data.coe). Once the program is executed, the third memory slot is filled with the GCD of the first two numbers.

Assembler

We have coded a simple assembler in python.

Usage

python assembler.py <asm file>

"instructions.coe" file will be generated.

We have already assembled "gcd.asm" into "instructions.coe". So, just load into instruction memory.