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项目作者： wuhanstudio

项目描述 ：
A 16-bit Hack CPU from scratch on FPGA.
高级语言： Verilog
项目地址: git://github.com/wuhanstudio/nand2tetris-iverilog.git
创建时间： 2020-11-12T23:16:39Z
项目社区：https://github.com/wuhanstudio/nand2tetris-iverilog
开源协议：
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Building a 16-bit CPU from Scratch on FPGA (nand2tetris)

  • Some may ask how many lines of code are required to design a simple programmable CPU?

  • The answer is less than 350 lines of verilog code.

  1. Starting from a single Nand gate, you'll build a 16-bit blinky CPU that runs on real-world FPGAs.

Prerequisites

A small laptop is enough for this project. No extra hardware required.

Software to be installed:

  • Make
  • iverilog
  • gtkwave

If you’d like to run this CPU on real FPGAs, here’s the synthesis report in Lattice Diamond:

  1. Design Summary
  2.    Number of registers:    152 out of  4635 (3%)
  3.       PFU registers:          152 out of  4320 (4%)
  4.       PIO registers:            0 out of   315 (0%)
  5.    Number of SLICEs:       134 out of  2160 (6%)
  6.       SLICEs as Logic/ROM:    134 out of  2160 (6%)
  7.       SLICEs as RAM:            0 out of  1620 (0%)
  8.       SLICEs as Carry:         10 out of  2160 (0%)
  9.    Number of LUT4s:        267 out of  4320 (6%)
  10.       Number used as logic LUTs:        247
  11.       Number used as distributed RAM:     0
  12.       Number used as ripple logic:       20
  13.       Number used as shift registers:     0
  14.    Number of PIO sites used: 5 + 4(JTAG) out of 105 (9%)
  15.    Number of block RAMs:  4 out of 10 (40%)
  16.    Number of GSRs:        0 out of 1 (0%)

It’s so tiny that virtually any randomly chosen FPGA should work.

Instructions

Detailed instructions will be given under each directory.

Step 1 - Environment Setup

Build useful gates starting from a single Nand gate.

  • Nand.v
  • Not.v
  • And.v
  • Or.v
  • Xor.v

Step 2 - ALU

Time to build an ALU.

  • Mux.v
  • Not16.v
  • And16.v
  • Mux16.v
  • Or8Way.v
  • HalfAdder.v
  • FullAdder.v
  • Add16.v
  • ALU.v

Step 3 - CPU

A working 16-bit CPU:

  • CPU.v

Step 4 - Computer

A programmable computer with input (buttons) and output (LEDs):

  • Reset.v
  • Memory.v
  • Rom.v
  • Hack.v