RAM4K.hdl

// 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/03/b/RAM4K.hdl

/**
 * Memory of 4K 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 RAM4K {
    IN in[16], load, address[12];
    OUT out[16];

    PARTS:
    // Put your code here:
    DMux8Way(in=load, sel=address[9..11], a=ain, b=bin, c=cin, d=din, e=ein, f=fin, g=gin, h=hin);
    RAM512(in=in, load=ain, address=address[0..8], out=aout);
    RAM512(in=in, load=bin, address=address[0..8], out=bout);
    RAM512(in=in, load=cin, address=address[0..8], out=cout);
    RAM512(in=in, load=din, address=address[0..8], out=dout);
    RAM512(in=in, load=ein, address=address[0..8], out=eout);
    RAM512(in=in, load=fin, address=address[0..8], out=fout);
    RAM512(in=in, load=gin, address=address[0..8], out=gout);
    RAM512(in=in, load=hin, address=address[0..8], out=hout);
    Mux8Way16(a=aout, b=bout, c=cout, d=dout, e=eout, f=fout, g=gout, h=hout, sel=address[9..11], out=out);
}