// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/3/a/RAM64.hdl
/**
 * Memory of sixty four 16-bit registers.
 * If load is asserted, the value of the register selected by
 * address is set to in; Otherwise, the value does not change.
 * The value of the selected register is emitted by out.
 */
CHIP RAM64 {
    IN in[16], load, address[6];
    OUT out[16];

    PARTS:
    DMux8Way(in=load, sel=address[0..2], a=x1, b=x2, c=x3, d=x4, e=x5, f=x6, g=x7, h=x8);
    RAM8(in=in, out=y1, load=x1, address=address[3..5]);
    RAM8(in=in, out=y2, load=x2, address=address[3..5]);
    RAM8(in=in, out=y3, load=x3, address=address[3..5]);
    RAM8(in=in, out=y4, load=x4, address=address[3..5]);
    RAM8(in=in, out=y5, load=x5, address=address[3..5]);
    RAM8(in=in, out=y6, load=x6, address=address[3..5]);
    RAM8(in=in, out=y7, load=x7, address=address[3..5]);
    RAM8(in=in, out=y8, load=x8, address=address[3..5]);
    Mux8Way16(a=y1, b=y2, c=y3, d=y4, e=y5, f=y6, g=y7, h=y8, sel=address[0..2], out=out);
}