// 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:
    // Put your code here:
    DMux8Way(in=load, sel=address[6..8], a=toRAM64A,
                                         b=toRAM64B,
                                         c=toRAM64C,
                                         d=toRAM64D,
                                         e=toRAM64E,
                                         f=toRAM64F,
                                         g=toRAM64G,
                                         h=toRAM64H);

    RAM64(in=in, load=toRAM64A, address=address[0..5], out=fromRAM64A);
    RAM64(in=in, load=toRAM64B, address=address[0..5], out=fromRAM64B);
    RAM64(in=in, load=toRAM64C, address=address[0..5], out=fromRAM64C);
    RAM64(in=in, load=toRAM64D, address=address[0..5], out=fromRAM64D);
    RAM64(in=in, load=toRAM64E, address=address[0..5], out=fromRAM64E);
    RAM64(in=in, load=toRAM64F, address=address[0..5], out=fromRAM64F);
    RAM64(in=in, load=toRAM64G, address=address[0..5], out=fromRAM64G);
    RAM64(in=in, load=toRAM64H, address=address[0..5], out=fromRAM64H);

    Mux8Way16(sel=address[6..8], out=out, a=fromRAM64A,
                                          b=fromRAM64B,
                                          c=fromRAM64C,
                                          d=fromRAM64D,
                                          e=fromRAM64E,
                                          f=fromRAM64F,
                                          g=fromRAM64G,
                                          h=fromRAM64H);
}