c

cpu.hdl

CHIP CPU {

    IN  inM[16],         // M value input  (M = contents of RAM[A])
        instruction[16], // Instruction for execution
        reset;           // Signals whether to re-start the current
                         // program (reset==1) or continue executing
                         // the current program (reset==0).

    OUT outM[16],        // M value output
        writeM,          // Write to M? 
        addressM[15],    // Address in data memory (of M)
        pc[15];          // address of next instruction

    PARTS:
    // Put your code here:
    Or16(a=instruction,b=instruction,out[15]=a1,out[12]=abit,out[11]=c1,out[10]=c2,out[9]=c3,out[8]=c4,out[7]=c5,out[6]=c6,out[5]=d1,out[4]=d2,out[3]=d3,out[2]=j1,out[1]=j2,out[0]=j3); // decoder
    Not(in=a1,out=ains);
	Not(in=ains,out=cins);	
	
    Mux16(a=muxin, b=instruction, sel=ains,out=out1);
	Or(a=ains,b=d1,out=Ain);
	ARegister(in=out1, load=Ain, out=out2,out[0..14]=addressM);
	
	Mux16(a=out2, b=inM, sel=abit, out=outalu1);

	And(a=cins,b=d2,out=loadD);
    DRegister(in=muxin, load=loadD, out=outalu2);

	ALU(x=outalu2, y=outalu1, zx=c1,nx=c2,zy=c3,ny=c4,f=c5,no=c6, zr=zrout, ng=ngout,out=outM,out=muxin);
	Not(in=zrout,out=nzr);
	Not(in=ngout,out=pg);
	And (a=pg,b=nzr,out=pos);
	And (a=ngout,b=j1,out=jl);
	And (a=zrout,b=j2,out=je);
	And (a=pos,b=j3,out=jg);
	
	Or8Way(in[0]=je,in[1]=jl,in[2]=jg,out=jmain2);
	And(a=cins,b=jmain2,out=jmain);
	PC(in=out2, inc=true, load=jmain, reset=reset, out[0..14]=pc);
    
    And (a=cins,b=d3,out=writeM);

}