43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
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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// Put your code here:
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Not(in=sel[0], out=notsel0);
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Not(in=sel[1], out=notsel1);
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Not(in=sel[2], out=notsel2);
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/* Create one selector signal for each of the eight cases. */
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And3(a=notsel0, b=notsel1, c=notsel2, out=sela);
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And3(a=sel[0], b=notsel1, c=notsel2, out=selb);
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And3(a=notsel0, b=sel[1], c=notsel2, out=selc);
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And3(a=sel[0], b=sel[1], c=notsel2, out=seld);
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And3(a=notsel0, b=notsel1, c=sel[2], out=sele);
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And3(a=sel[0], b=notsel1, c=sel[2], out=self);
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And3(a=notsel0, b=sel[1], c=sel[2], out=selg);
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And3(a=sel[0], b=sel[1], c=sel[2], out=selh);
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And(a=in, b=sela, out=a);
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And(a=in, b=selb, out=b);
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And(a=in, b=selc, out=c);
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And(a=in, b=seld, out=d);
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And(a=in, b=sele, out=e);
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And(a=in, b=self, out=f);
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And(a=in, b=selg, out=g);
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And(a=in, b=selh, out=h);
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}
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