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// This file is part of the materials accompanying the book
// "The Elements of Computing Systems" by Nisan and Schocken,
// MIT Press. Book site: www.idc.ac.il/tecs
// File name: projects/03/b/RAM512.hdl
/**
* Memory of 512 registers, each 16 bit-wide. Out holds the value
* stored at the memory location specified by address. If load==1, then
* the in value is loaded into the memory location specified by address
* (the loaded value will be emitted to out from the next time step onward).
*/
CHIP RAM512 {
IN in[16], load, address[9];
OUT out[16];
PARTS:
DMux8Way(in=load, sel=address[6..8], a=l0, b=l1, c=l2, d=l3, e=l4, f=l5, g=l6, h=l7);
RAM64(in=in, load=l0, address=address[0..5], out=o0);
RAM64(in=in, load=l1, address=address[0..5], out=o1);
RAM64(in=in, load=l2, address=address[0..5], out=o2);
RAM64(in=in, load=l3, address=address[0..5], out=o3);
RAM64(in=in, load=l4, address=address[0..5], out=o4);
RAM64(in=in, load=l5, address=address[0..5], out=o5);
RAM64(in=in, load=l6, address=address[0..5], out=o6);
RAM64(in=in, load=l7, address=address[0..5], out=o7);
Mux8Way16(a=o0, b=o1, c=o2, d=o3, e=o4, f=o5, g=o6, h=o7, sel=address[6..8], out=out);
}
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