hw5.md

HW5

1-DFF (Data Flip-flop)

D型正反器,
兩個輸入,一個資料輸入;一個時脈輸入,
一個輸出,
時脈由0轉1時,輸入的值＝輸出的值.

2-BIT

• CODE

// 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/03/a/Bit.hdl

/**
 * 1-bit register:
 * If load[t] == 1 then out[t+1] = in[t]
 *                 else out does not change (out[t+1] = out[t])
 */

CHIP Bit {
    IN in, load;
    OUT out;

    PARTS:
    // Put your code here:
    Mux(a=gayout,b=in,sel=load,out=a);
    DFF(in=a,out=out,out=gayout);
}

3-REGISTER

• CODE

// 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/03/a/Register.hdl

/**
 * 16-bit register:
 * If load[t] == 1 then out[t+1] = in[t]
 * else out does not change
 */

CHIP Register {
    IN in[16], load;
    OUT out[16];

    PARTS:
    // Put your code here:
    Bit(in=in[0],load=load,out=out[0]);
    Bit(in=in[1],load=load,out=out[1]);
    Bit(in=in[2],load=load,out=out[2]);
    Bit(in=in[3],load=load,out=out[3]);
    Bit(in=in[4],load=load,out=out[4]);
    Bit(in=in[5],load=load,out=out[5]);
    Bit(in=in[6],load=load,out=out[6]);
    Bit(in=in[7],load=load,out=out[7]);
    Bit(in=in[8],load=load,out=out[8]);
    Bit(in=in[9],load=load,out=out[9]);
    Bit(in=in[10],load=load,out=out[10]);
    Bit(in=in[11],load=load,out=out[11]);
    Bit(in=in[12],load=load,out=out[12]);
    Bit(in=in[13],load=load,out=out[13]);
    Bit(in=in[14],load=load,out=out[14]);
    Bit(in=in[15],load=load,out=out[15]);
}

• PICTURE