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32 lines
946 B
Plaintext
32 lines
946 B
Plaintext
// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/01/DMux8Way.hdl
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/**
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* 8-way demultiplexor:
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* {a, b, c, d, e, f, g, h} = {in, 0, 0, 0, 0, 0, 0, 0} if sel == 000
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* {0, in, 0, 0, 0, 0, 0, 0} if sel == 001
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* etc.
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* {0, 0, 0, 0, 0, 0, 0, in} if sel == 111
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*/
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CHIP DMux8Way {
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IN in, sel[3];
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OUT a, b, c, d, e, f, g, h;
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PARTS:
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DMux4Way(in=in, sel=sel[0..1], a=pa, b=pb, c=pc, d=pd);
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DMux4Way(in=in, sel=sel[0..1], a=pe, b=pf, c=pg, d=ph);
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Not(in=sel[2], out=notsel2);
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And(a=pa, b=notsel2, out=a);
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And(a=pb, b=notsel2, out=b);
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And(a=pc, b=notsel2, out=c);
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And(a=pd, b=notsel2, out=d);
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And(a=pe, b=sel[2], out=e);
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And(a=pf, b=sel[2], out=f);
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And(a=pg, b=sel[2], out=g);
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And(a=ph, b=sel[2], out=h);
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} |