From Nand to Tetris 里的 Project 5 (Computer 部分)让我们按照 From Nan

让我们按照 From Nand to Tetris 里 Project 5 的要求，来完成下列的设计。

1. Memory (已完成，可以参考 From Nand to Tetris 里的 Project 5 (Memory 部分) 一文)
2. CPU (已完成，可以参考 From Nand to Tetris 里的 Project 5 (CPU 部分) 一文)
3. Computer

本文只涉及 Computer 的实现

说明

我是阅读了《计算机系统要素 (第2版)》第 5 章的内容后才去完成 Project 5 的。读者朋友在完成 Project 5 时，如果遇到不明白的地方，可以参考书中的描述。书中第 68 页和第 69 页有如下内容，可供参考。

正文

前往 Nand to Tetris Online IDE，选择 Project 5 里的 Computer ⬇️

我们的目标是实现 Computer (计算机)，原始的代码如下 ⬇️

// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/5/Computer.hdl
/**
 * The Hack computer, consisting of CPU, ROM and RAM.
 * When reset = 0, the program stored in the ROM executes.
 * When reset = 1, the program's execution restarts. 
 * Thus, to start running the currently loaded program,
 * set reset to 1, and then set it to 0. 
 * From this point onwards, the user is at the mercy of the software.
 * Depending on the program's code, and whether the code is correct,
 * the screen may show some output, the user may be expected to enter
 * some input using the keyboard, or the program may do some procerssing. 
 */
CHIP Computer {

    IN reset;

    PARTS:
    //// Replace this comment with your code.
}

实现功能

《计算机系统要素 (第2版)》一书第 69 页有如下内容可供参考

我们需要将以下芯片组合在一起

ROM32K
CPU
Memory

参考上图，可以写出如下的代码 ⬇️

CHIP Computer {

    IN reset;

    PARTS:
    ROM32K(address= pc, out= instruction);
    CPU(inM= inM, instruction= instruction, reset= reset, outM= outM, writeM= writeM, addressM= addressM, pc= pc);
    Memory(in= outM, load= writeM, address= addressM, out= inM);
}