https://github.com/hellebenjamin/p4-cpu

Simple single cycle 4-bit cpu
https://github.com/hellebenjamin/p4-cpu

Last synced: 10 months ago
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Simple single cycle 4-bit cpu

• Host: GitHub
• URL: https://github.com/hellebenjamin/p4-cpu
• Owner: HelleBenjamin
• License: mit
• Created: 2024-06-03T20:03:56.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2024-06-13T22:51:35.000Z (about 2 years ago)
• Last Synced: 2025-03-28T16:13:03.442Z (over 1 year ago)
• Language: C++
• Size: 3.77 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
![The P4 cpu](https://github.com/Pepe-57/p4-cpu/blob/main/p4.jpg)

# P4 CPU

P4 is a simple 4-bit single-cycle prosessor with 2-bit instruction set. Check the [user manual](https://github.com/Pepe-57/p4-cpu/blob/main/P4_user_manual_en.pdf) for more information. 

## Registers

The P4 contains two General-Purpose Registers (GPR) and two Special-Purpose Registers (SPR).

### GPR

- REG A: A 4-bit register that is used for the ALU.

- REG OR: A 4-bit register that is used for a result of an ALU operation.

### SPR

- PC: 4-bit or 6-bit register that points the next instruction in memory.

- IR: 6-bit register that is holds current instruction byte fetched from memory.

## Instruction set

The P4 has 4 diffent instructions. Every instruction takes a single clock cycle to complete.

- NOP    No operation

- LDA n  Load A with immediate value

- ADD n  Add A with immediate value -> OR

- JMP n  Unconditional jump, PC = immediate