// 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/03/1/Bit.hdl



/**

 * 1-bit memory register.

 * If load[t-1]=1 then out[t] = in[t-1]

 * else out does not change (out[t] = out[t-1])

 */



CHIP Bit {



    IN  in, load;

    OUT out;



    PARTS:

    Mux(a=dffOut, b=in, sel=load, out=dffIn);

    DFF(in=dffIn, out=out, out=dffOut);

}