55 lines
1.6 KiB
Plaintext
Executable File
55 lines
1.6 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/3/b/RAM512.hdl
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/**
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* Memory of 512 16-bit registers.
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* If load is asserted, the value of the register selected by
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* address is set to in; Otherwise, the value does not change.
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* The value of the selected register is emitted by out.
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*/
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CHIP RAM512 {
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IN in[16], load, address[9];
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OUT out[16];
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PARTS:
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// Figuring out which RAM64 to write to
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DMux8Way(
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in=load,
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sel=address[6..8],
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a=load01,
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b=load02,
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c=load03,
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d=load04,
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e=load05,
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f=load06,
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g=load07,
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h=load08
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);
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// Writing the correct RAM address inside the register
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RAM64(in=in, load=load01, address=address[0..5],out=ram64out01);
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RAM64(in=in, load=load02, address=address[0..5],out=ram64out02);
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RAM64(in=in, load=load03, address=address[0..5],out=ram64out03);
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RAM64(in=in, load=load04, address=address[0..5],out=ram64out04);
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RAM64(in=in, load=load05, address=address[0..5],out=ram64out05);
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RAM64(in=in, load=load06, address=address[0..5],out=ram64out06);
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RAM64(in=in, load=load07, address=address[0..5],out=ram64out07);
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RAM64(in=in, load=load08, address=address[0..5],out=ram64out08);
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// Reading the selected RAM Register
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Mux8Way16(
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a=ram64out01,
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b=ram64out02,
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c=ram64out03,
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d=ram64out04,
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e=ram64out05,
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f=ram64out06,
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g=ram64out07,
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h=ram64out08,
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sel=address[6..8],
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out=out
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);
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} |