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:
    DMux8Way(in=load, sel=address[9..11], a=loadA, b=loadB, c=loadC, d=loadD, e=loadE, f=loadF, g=loadG, h=loadH);
    RAM512(in=in, load=loadA, address=address[0..8], out=outA);
    RAM512(in=in, load=loadB, address=address[0..8], out=outB);
    RAM512(in=in, load=loadC, address=address[0..8], out=outC);
    RAM512(in=in, load=loadD, address=address[0..8], out=outD);
    RAM512(in=in, load=loadE, address=address[0..8], out=outE);
    RAM512(in=in, load=loadF, address=address[0..8], out=outF);
    RAM512(in=in, load=loadG, address=address[0..8], out=outG);
    RAM512(in=in, load=loadH, address=address[0..8], out=outH);
    Mux8Way16(a=outA, b=outB, c=outC, d=outD, e=outE, f=outF, g=outG, h=outH, sel=address[9..11], out=out);
}