42 lines
1.2 KiB
Plaintext
Executable File
42 lines
1.2 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/RAM16K.hdl
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/**
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* Memory of 16K 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 RAM16K {
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IN in[16], load, address[14];
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OUT out[16];
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PARTS:
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// Figuring out which RAM4k to write to
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DMux4Way(
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in=load,
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sel=address[12..13],
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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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);
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// Writing the correct RAM address inside the register
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RAM4K(in=in, load=load01, address=address[0..11],out=ram4Kout01);
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RAM4K(in=in, load=load02, address=address[0..11],out=ram4Kout02);
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RAM4K(in=in, load=load03, address=address[0..11],out=ram4Kout03);
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RAM4K(in=in, load=load04, address=address[0..11],out=ram4Kout04);
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// Reading the selected RAM Register
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Mux4Way16(
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a=ram4Kout01,
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b=ram4Kout02,
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c=ram4Kout03,
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d=ram4Kout04,
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sel=address[12..13],
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out=out
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);
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} |