19 lines
535 B
Plaintext
19 lines
535 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/02/FullAdder.hdl
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/**
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* Computes the sum of three bits.
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*/
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CHIP FullAdder {
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IN a, b, c; // 1-bit inputs
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OUT sum, // Right bit of a + b + c
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carry; // Left bit of a + b + c
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PARTS:
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HalfAdder(a=a, b=b, sum=ha1sum, carry=ha1carry);
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HalfAdder(a=ha1sum, b=c, sum=sum, carry=ha2carry);
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Or(a=ha1carry, b=ha2carry, out=carry);
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} |