|
|
hello everyone, i'm working on the project 2, and i met this kind of error when i submitted my work for ALU.hdl. "Line 65, zerox has no source pin". I've tried to fix, but its not working
CHIP ALU {
IN
x[16], y[16], // 16-bit inputs
zx, // zero the x input?
nx, // negate the x input?
zy, // zero the y input?
ny, // negate the y input?
f, // compute (out = x + y) or (out = x & y)?
no; // negate the out output?
OUT
out[16], // 16-bit output
zr, // if (out == 0) equals 1, else 0
ng; // if (out < 0) equals 1, else 0
PARTS:
//// Mux16(a=x, b[0..15]=false, sel=zx, out=zerox);
Not16(in=zerox, out=notx);
Mux16(a=zerox, b=notx, sel=nx, out=presetx);
Mux16(a=y, b[0..15]=false, sel=zy, out=zeroy);
Not16(in=zeroy, out=noty);
Mux16(a=zeroy, b=noty, sel=ny, out=presety);
Add16(a=presetx, b=presety, out=addxy);
And16(a=presetx, b=presety, out=andxy);
Mux16(a=andxy, b=addxy, sel=f, out=operatedxy);
Not16(in=operatedxy, out=notout);
Mux16(a=operatedxy, b=notout, sel=no, out[0..7]=lowout, out[8..15]=highout, out[15]=ng, out=out);
Or8Way(in=lowout, out=orlowout);
Or8Way(in=highout, out=orhighout);
Or(a=orlowout, b=orhighout, out=notzr);
Not(in=notzr, out=zr);
}
thank you all!!
|
Locked
