MIPS Single Cycle Processor Simulator

Description

MIPS Single Cycle Processor Simulator

MIPS Single Cycle Processor Simulator – Understanding how software instructions translate into hardware signals is a foundational milestone for computer science students, software engineers, and digital design professionals. The MIPS Single Cycle Processor Simulator provides an immersive, visual environment built to demystify micro architecture execution.

By modeling a 32-bit Harvard Architecture CPU executing one instruction per clock cycle, this software allows users to observe, debug, and understand every electrical pathway, control bit, and register mutation inside a classic RISC processor.

Core Architecture & Execution Model

The MIPS Single Cycle Simulator faithfully implements the standard 32-bit MIPS-I instruction set architecture (ISA). In a single-cycle implementation, every step of instruction processing—Fetch, Decode, Execute, Memory Access, and Write-Back—occurs within a single unified clock edge.

Because every operation completes in one cycle, learners gain a crystal-clear mental model of how signal control lines coordinate hardware sub-components without the masking complexity of hardware pipelines or multi-cycle state machines.

Key Features & Capabilities

• Full MIPS Instruction Set Coverage: Execute R-type (e.g., add, sub, and, or, slt), I-type (e.g., lw, sw, addi, beq, bne), and J-type (e.g., j, jal) instructions with full architectural compliance.
• Dynamic Datapath Visualization: Watch multiplexers, the Arithmetic Logic Unit (ALU), sign-extenders, and memory units illuminate dynamically based on the active control signals (RegWrite, ALUOp, ALUSrc, MemRead, MemWrite, MemToReg).
• Interactive Register File Inspection: Real-time visibility into all 32 general-purpose registers (GPRs), including hardwired zero ($zero), temporary registers ($t0–$t9), saved registers ($s0–$s7), stack pointer ($sp), and return address ($ra).
• Isolated Instruction & Data Memory: Configurable Harvard-architecture memory spaces allow precise byte/word inspection and direct editing of memory addresses before and during code execution.
• Step-by-Step & Auto Execution: Run programs at customizable clock speeds or advance single clock cycles manually to pinpoint bugs in assembly logic.
• Built-in Assembler & Disassembler: Write clean MIPS assembly code directly inside the integrated editor, convert code to 32-bit binary/hexadecimal formats, and dissemble hex dumps instantly.

Detailed Technical Specifications

Who Is This Simulator Built For?

University Students & Computer Science Majors

Bridge the gap between theoretical textbooks (such as Computer Organization and Design by Patterson & Hennessy) and practical CPU implementation. Build a foundational understanding of microarchitecture before tackling modern pipelined or superscalar architectures.

CS Educators & University Instructors

Demonstrate hardware mechanics visually in the classroom. Generate test cases, illustrate how instruction decoding operates, and assign engaging assembly assignments without requiring physical FPGA development boards.

Hardware Engineers & Verilog/VHDL Developers

Use the single-cycle model as a functional software reference to verify digital RTL designs, instruction decoder logic, and control unit truth tables.

Frequently Asked Questions

How does a single-cycle simulator differ from a pipelined simulator?

In a single-cycle processor, a single instruction completes in its entirety within one clock cycle. A pipelined simulator models modern CPUs where multiple instructions overlap across separate hardware stages simultaneously. The single-cycle simulator simplifies learning by showing pure control signal generation without hazards, stalls, or forwarding mechanisms.

Can I load raw machine code into the simulator?

Yes. You can write MIPS assembly directly within the built-in IDE or load pre-compiled .hex or .bin files directly into Instruction Memory.

Does this software support hardware interrupts or floating-point operations?

The core simulator focuses on the standard integer MIPS-I ISA (R, I, and J instruction formats). It is designed primarily for foundational CPU architecture courses rather than floating-point coprocessor (COP1) emulation.