DCPU-16 Microprocessor

Copyright (C) 2012 Shawn Tan shawn.tan@sybreon.com. All Rights Reserved.

Released under LGPL3.

Introduction

This project is a hardware implementation of the DCPU-16 microprocessor designed by Marcus Persson (@notch) for his new game 0x10c.

The core is written entirely in synthesisable Verilog RTL.

Pipeline

It has an 8-stage integer pipeline, split into two parts, each with 4-stages. Each stage can run within a single clock cycle. Therefore, the maximum effective rate for executing an instruction is 4-clock cycles.

• Fetch (FE) - fetches instructions from memory.
• Decode (DE) - decodes the instruction.
• Calc A (EA) - calculates the effective address for A.
• Calc B (EB) - calculates it for B.
• Load A (LA) - loads operand A.
• Load B (LB) - loads operand B.
• Execute (EX) - executes the instruction.
• Store A (SA) - stores operand A.

Synthesis

Currently synthesises on a Spartan 6 to about:

• 500 Slices @ 149 MHz

Status

It is not FPGA proven, yet.