QkoSad
44 lines
1.3 KiB
Plaintext
Executable File
44 lines
1.3 KiB
Plaintext
Executable File
// 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/03/a/PC.hdl
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/**
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* A 16-bit counter with load and reset control bits.
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* if (reset[t] == 1) out[t+1] = 0
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* else if (load[t] == 1) out[t+1] = in[t]
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* else if (inc[t] == 1) out[t+1] = out[t] + 1 (integer addition)
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* else out[t+1] = out[t]
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*/
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CHIP PC {
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IN in[16],load,inc,reset;
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OUT out[16];
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PARTS:
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DMux8Way(in=true,sel[0]=reset,sel[1]=load,sel[2]=inc,a=a,b=b,c=c,d=d,e=e,f=f,g=g,h=h);
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DFF(in=inc,out=inct);
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And(a=inc,b=inct,out=out1);
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Mux16(a=in,b=out4,sel=out1,out=out2);
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Inc16(in=out2,out=out3);
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Register(in=out3,load=load,out=out4,out=out);
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Not(in=a,out=notа);
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Register(in=in,load=notа,out=outA);
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And16(a[0..15]=false,b[0..15]=false,out=outB);
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Register(in=in,load=c,out=outC);
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And16(a[0..15]=false,b[0..15]=false,out=outD);
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And16(a[0..15]=false,b[0..15]=false,out=outF);
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Register(in=in,load=g,out=outG);
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And16(a[0..15]=false,b[0..15]=false,out=outH);
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And16(a[0..15]=false,b[0..15]=false,out=outE);
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Mux8Way16(a=outA,b=outB,c=outC,d=outD,e=outE,f=outF,g=outG,h=outH,sel[0]=reset,sel[1]=load,sel[2]=inc,out=out67);
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} |