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32 lines
824 B
Plaintext
32 lines
824 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/Mux4Way16.hdl
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/**
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* 4-way 16-bit multiplexor:
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* out = a if sel == 00
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* b if sel == 01
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* c if sel == 10
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* d if sel == 11
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*/
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CHIP Mux4Way16 {
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IN a[16], b[16], c[16], d[16], sel[2];
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OUT out[16];
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PARTS:
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Nand(a=sel[0], b=sel[1], out=shouldAorBorC);
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And(a=sel[0], b=sel[1], out=shouldD);
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Xor(a=sel[0], b=sel[1], out=shouldBorC);
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And(a=shouldBorC, b=sel[0], out=shouldB);
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And(a=shouldBorC, b=sel[1], out=shouldC);
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Nand(a=shouldAorBorC, b=shouldBorC, out=shouldA);
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Mux16(a=c, b=b, sel=shouldB, out=BorC);
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Mux16(a=a, b=d, sel=shouldD, out=DorA);
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Mux16(a=DorA, b=BorC, sel=shouldBorC, out=out);
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} |