2.1 5-stage Pipelined CPU

As we learnt in the lecture, the processor acquires 5 clock cycle to execute one instruction.

In the first clock cycle, the CPU read one instruction in the instruction memory with the new given pc address. In the second, the processor will divide the instruction to different parts and decode the MIPS instruction with the registers and control unit. The operation code and function code in MIPS instruction are sent to the control unit, which recognize the type of an instruction. In the third cycle 3, ALU will handle arithmetic, logical, shifting, and conditional branch instructions. In the fourth cycle, data will be fetched from or stored to the data memory by data transfer instructions. In the fifth cycle, data will be written back to registers if needed.

2.2 Supported MIPS Instructions

You are required to support the following MIPS instructions.

Data transfer instructions:

Arithmetic instructions:

– add, addu, addi, addiu, sub, subu

Logical instructions

– and, andi, nor, or, ori, xor, xori

Shifting instructions

– sll, sllv, srl, srlv, sra, srav

Branch/Jump instructions:

– beq, bne, slt

– j, jr, jal

2.3 Usage of the Provided Module

We have provided the instruction memory and data memory to you. For the simplicity, the memory space of the instructions and data are separate. The usage is listed below. You can modify the module. However, you should preserve the module name ,RAM, and DATA_RAM variables.

Note: The address unit of both memory is in word. Hence, you should manually transfer address from byte space to word space.

module InstructionRAM // read-only

( // Inputs

input CLOCK // clock

, input RESET // reset

, input ENABLE

, input [31:0] FETCH_ADDRESS

// Outputs

, output reg [31:0] DATA

endmodule

module MainMemory //data memory

( // Inputs

input CLOCK // clock

, input RESET // reset

, input ENABLE

, input [31:0] FETCH_ADDRESS

, input [64:0] EDIT_SERIAL // {1’b[is_edit], 32’b[write_add],

32’b[write_data]}

// Outputs

, output reg [31:0] DATA

endmodule

2.4 Testing Samples

You should evaluate the performance of your code and write your report based on these testing samples. The folder includes 8 testing cases and you can find the details in the “About test.pdf” file.

Regarding the code you submit. your CPU should display the whole Main Memory in the screen.

The strategy to end your program is at the point where your CPU execute 32’hffffffff instruction.

we will use your testbench module and an instruction file named “instructions.bin” to test your project. Please set the input file name as above in your project.

3.1 Requirements

You can handle more than two Verilog files. You will need to write your own makefile.

4.1 Deadline

The deadline of this project is 05/01/2022 midnight.

4.2 Submission

You should put all of your source files in a folder and compress it in a zip. Name it with your

student ID. Submit it through BB.

4.3 Grading

This project worth 20% of your total grade. There will be 20% extra credits in terms of the completeness of pipeline. The code you submit needs to have detailed comments, otherwise 10% of your grade will be deducted. The grading details of this project will be:

The less clock cycle your CPU spends on the program, the more bonus credits you get.

NOTICE: If your code does not support makefile, you will lose 50% automatic.

4.4 Report

4.5 Honesty

We take your honesty seriously. If you are caught copying others’ code, you will get an automatic 0 in this project. Please write your own code.