Loading chip never stops...

[ChaseW]

When I try to open an unchanged .hdl file in projects01.zip (after extraction) it lets me open it and runs fine.
But when i go to create my own .hdl file it just says "Loading chip..." and never finishes, how can I fix it?

This is the Mux Chip im trying to create;

[Correct solution removed by admin.]

PS: im using note pad to create my .hdl file is there a better external text editer i can use. Im very new at this. Any help would be much appreciated

Thanks
Chase

[ChaseW]

dont worry think i figured it out, need to actually create the simple gates first... i hope :)

[ChaseW]

Nope! still get same problem whether i use built-in chips of composite ones. It will just keep trying to load the chip.

Any suggestions would be great

Thanks
Chase

[Chasew]

Figured out that you have to use Nand gate to make up all the others, so it works now.

Sorry if i wasted somebodies time :S

[cadet1620]

Usually, when the simulator hangs loading an HDL file is is because of a recursive definition. For instance your And uses Not which uses And.

You need to implement the chips in the order listed in the book: build Not using Nand, then And using Not and Nand, then Or using some combination of And, Nand and Not.

You don't want to use only Nand gates. The ALU from chapter 2 takes 440 Nand gates!

--Mark

[cadet1620]

ChaseW wrote

PS: im using note pad to create my .hdl file is there a better external text editer i can use. Im very new at this. Any help would be much appreciated

Thanks
Chase

I like Notepad++, http://notepad-plus-plus.org/

--Mark

[ybakos]

Another excellent editor, available on windows, linux and macos: Sublime Text 2.

[freak]

Can you please specify which book and from.where I can choose the order

[cadet1620]

The book is The Elements of Computing Systems: Building a Modern Computer from First Principles.

You can get PDFs of the Hardware chapters from the Course page at Nand2Tetris web site.

--Mark

[freak]

If iam giving

And( in =a,in = b,out = out )
It is not getting loaded .do we need to use some simple gates to create an AND chip ??

[cadet1620]

If you have not done so, read the Hardware Construction Survival Guide.

Read Chapter 1. Implement the chips in the order presented starting at section 1.2.2 (page 19).

Implement and test Not chip using only Nand in the PARTS section.
Implement and test And chip using Nand and Not.
Implement and test OR chip using combination of Nand, Not and And.
Etc.

Hint for Or chip -- read about De Morgan's laws.

--Mark

[freak]

iam getting an error like chip name doesnt match the HDL name
i am trying for AND gate and i just added the below line to ensure if iam
not gettng any error on using NAND gate
NAND (in=a,in=b,out = out);
 but iam not sure regarding this error

[Admin edit to remove email quote.]

[freak]

Thank you,i got it

[Admin edit to remove email quote.]