Keep getting HDL errors ALU.hdl

[OppaErich]

Hi,

[oppa@oppa-F28 02]$ HardwareSimulator ALU.hdl
In script /home/oppa/Dokumente/MOOCs/Coursera/nand2tetris/projects/02/ALU.hdl, Line 30, Illegal terminator: '{'

...
CHIP ALU {
    IN  <- this is line 30
        x[16], y[16],  // 16-bit inputs        
        zx, // zero the x input?
...

Before this I had trouble with the zero and sign status bits, impossible to distribute outputs in HDL. So I just deleted these to test the ALU without the status bits but then this error came up.

When I load this file into a running simulator I get "Line 57, yx has no source pin.

   Not16 (in=xfy, out=notxfy);
   Mux16 (a=xfy, b=notxfy, sel=no, out=out);
} <- This is line 57 and there is no yx in my code.

[cadet1620]

OppaErich wrote

[oppa@oppa-F28 02]$ HardwareSimulator ALU.hdl
In script /home/oppa/Dokumente/MOOCs/Coursera/nand2tetris/projects/02/ALU.hdl, Line 30, Illegal terminator: '{'

The tools only accept .tst files on their command line.

Before this I had trouble with the zero and sign status bits, impossible to distribute outputs in HDL. So I just deleted these to test the ALU without the status bits but then this error came up.

You can connect more than one wire to an output.

    Xxx16(..., out=out, out[0:7]=outLow, ...);

When I load this file into a running simulator I get "Line 57, yx has no source pin.

   Not16 (in=xfy, out=notxfy);
   Mux16 (a=xfy, b=notxfy, sel=no, out=out);
} <- This is line 57 and there is no yx in my code.

Somewhere in your code there is a "=xy". If you deleted code using /* */, make sure that you didn't nest comments.

Note that there is a ALU-nostat.tst that can be used to test the computation part of the ALU, ignoring the status outputs.

--Mark

[OppaErich]

cadet1620 wrote

The tools only accept .tst files on their command line.

Aha, didn't know.

You can donnect more than one wire to an output.

    Xxx16(..., out=out, out[0:7]=outLow, ...);

Ah, this may help with the status bits.

Somewhere in your code there is a "=xy". If you deleted code using /* */, make sure that you didn't nest comments.

Note that there is a ALU-nostat.tst that can be used to test the computation part of the ALU, ignoring the status outputs.

Yeah, of course. I just could not find it. I took a break and some food and found it then. It was at the 2nd line of my HDL. After corectin this, the ALU passed all nostat-tests. Let me try the status bits again.

Thanks,
Stephan

[OppaErich]

Hi,

I have no idea how to do this.

   Mux16 (a=xfy, b=notxfy, sel=no, out=out, out=zout, out[15]=zr);
   Or16Way (a=zout, out=zr);

This does not work. ~"Output may only be fed once" or so.

Edit: Sorry, that was me. zr is the double name. And I found a bug. The Or has to be Nor. ALU.tst does run now.

Edit: And "Comparison ended successfully"