79 lines
2.1 KiB
Plaintext
79 lines
2.1 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/Mux16.hdl
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/**
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* 16-bit multiplexor:
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* for i = 0..15 out[i] = a[i] if sel == 0
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* b[i] if sel == 1
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*/
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// COST = 113
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CHIP Mux16 {
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IN a[16], b[16], sel;
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OUT out[16];
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PARTS:
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// 1 NAND
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Not(in=sel, out=n);
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// Output stream if sel == 0
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// 32 NANDs
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And(a=a[0], b=n, out=x0);
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And(a=a[1], b=n, out=x1);
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And(a=a[2], b=n, out=x2);
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And(a=a[3], b=n, out=x3);
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And(a=a[4], b=n, out=x4);
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And(a=a[5], b=n, out=x5);
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And(a=a[6], b=n, out=x6);
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And(a=a[7], b=n, out=x7);
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And(a=a[8], b=n, out=x8);
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And(a=a[9], b=n, out=x9);
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And(a=a[10], b=n, out=x10);
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And(a=a[11], b=n, out=x11);
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And(a=a[12], b=n, out=x12);
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And(a=a[13], b=n, out=x13);
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And(a=a[14], b=n, out=x14);
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And(a=a[15], b=n, out=x15);
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// 32 NANDs
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// Output stream if sel == 0
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And(a=b[0], b=sel, out=y0);
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And(a=b[1], b=sel, out=y1);
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And(a=b[2], b=sel, out=y2);
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And(a=b[3], b=sel, out=y3);
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And(a=b[4], b=sel, out=y4);
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And(a=b[5], b=sel, out=y5);
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And(a=b[6], b=sel, out=y6);
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And(a=b[7], b=sel, out=y7);
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And(a=b[8], b=sel, out=y8);
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And(a=b[9], b=sel, out=y9);
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And(a=b[10], b=sel, out=y10);
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And(a=b[11], b=sel, out=y11);
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And(a=b[12], b=sel, out=y12);
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And(a=b[13], b=sel, out=y13);
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And(a=b[14], b=sel, out=y14);
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And(a=b[15], b=sel, out=y15);
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// 48 NANDs
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// Final output stream is a OR(x,y)
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Or(a=x0, b=y0, out=out[0]);
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Or(a=x1, b=y1, out=out[1]);
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Or(a=x2, b=y2, out=out[2]);
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Or(a=x3, b=y3, out=out[3]);
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Or(a=x4, b=y4, out=out[4]);
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Or(a=x5, b=y5, out=out[5]);
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Or(a=x6, b=y6, out=out[6]);
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Or(a=x7, b=y7, out=out[7]);
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Or(a=x8, b=y8, out=out[8]);
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Or(a=x9, b=y9, out=out[9]);
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Or(a=x10, b=y10, out=out[10]);
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Or(a=x11, b=y11, out=out[11]);
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Or(a=x12, b=y12, out=out[12]);
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Or(a=x13, b=y13, out=out[13]);
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Or(a=x14, b=y14, out=out[14]);
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Or(a=x15, b=y15, out=out[15]);
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}
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