Global constants definition problem

Hello, Try to recompile ALL sources which references to this package. I think about modelsim don't check & update referenced variables under compilation process in other sources.

Best regards

Weng Tianxiang wrote:

Hi Jozsef, I re-compiled every modules, but the constants in global package don't change as if they were compiled once and never re-compiled again.

I even deleted all work directory contents, recompile every modules, but constants in the global package still don't change.

That is what I have experienced.

Any other ideas?

Weng

Maybe they are declared in more than one place.

-- Mike Treseler

Hi MIke, Never!

I tried to move all constant definitions from package entity module to package body module, all constants usage are errors.

Weng

Hi, Is it possible that the error happens because I have used 2 levels of constants:

constant DATA_BITS : integer := 16;

...

I've just been through something similar. What happened in my case was:

the package was compiled into a library, and included in my desigh via "Library/Use" statements.

The library was mapped into a particular Modelsim directory, and this mapping was stored in modelsim.ini, in the directory where I was working on the package.

Later, when I worked on the design, I found it using an OLD version of the package - because its mapping for that library was in a DIFFERENT modelsim.ini file (because the design was in a different place from the package).

I got into this mess because this project was a combination of two older ones, and not a fresh start.

This may not be your problem, but it's worth checking the library mapping paths in ALL relevant versions of modelsim.ini are what you expect.

- Brian

Hi, Thank you everyone who gave me an answer.

The problem is resolved, I would like to share the lesson I learned from this experience.

1. Original code: DATABITS_16_32_64 DATABITS_16_32_64, DEPTH => LEVEL_X) port map ( ... ); end generate;

The problem is the following statement: DATABITS_16_32_64 64, DEPTH => LEVEL_X) port map ( ... ); end generate;

BlockRAM_64 : if DATABITS = 32 generate BlockRAM_0: BlockRAM generic map ( DATABITS => 32, DEPTH => LEVEL_X) port map ( ... ); end generate;

BlockRAM_64 : if(DATABITS /= 64 and DATABITS /= 32) generate BlockRAM_0: BlockRAM generic map ( DATABITS => 16, DEPTH => LEVEL_X) port map ( ... ); end generate; end generate;

Thank you.

Weng

Weng Tianxiang:

Why do you make DATABITS_16_32_64 a signal? All your problems derive from that. It looks like a constant to me.

Something like this would evaluate before the generic maps: constant DATABITS_16_32_64: integer := (((DATABITS-1)/16)+1)*16;

DATABITS 4 to 16 : DATABITS_16_32_64 is 16 DATABITS 32 : DATABITS_16_32_64 is 32 DATABITS 64 : DATABITS_16_32_64 is 64.

Other cases irrelevant, I assume.

Hi Jr, Wow! Wonderful !!!

Your answer is very clever and absolute better than mine. I will use your code immediately without any conditions.

I learned a trick from you.

Thank you very much.

Weng