timing constraints

[Frank van Eijkelenburg]

Hi,

I'm using a gigabit ethernet mac generated by coregen. Coregen generates a
toplevel example and an .ucf file with some timing constraints, for
instance:

############################################################
# PCS/PMA Clock period Constraints: please do not relax #
############################################################
NET brefclk_ibufg TNM_NET = brefclk;
TIMESPEC TS_brefclk = PERIOD brefclk 16 ns HIGH 50 %;

This brefclk_ibufg signal is coming from a dcm that is in the generated
toplevel. Now I have some wrappers around the "coregen toplevel" and assign
the .ucf file to my own toplevel. But at that moment the signal
brefclk_ibufg is not found anymore:

Annotating constraints to design from file
"../../Gb_eth/vhdl_source/gb_eth_rtx.ucf" ...
ERROR:NgdBuild:756 - Line 19 in '../../Gb_eth/vhdl_source/gb_eth_rtx.ucf':
Could
not find net(s) 'brefclk_ibufg' in the design. To suppress this error
specify the correct net name or remove the constraint.

I tried something with paths, without success. Does anyone know how to fix
this? Do I have to route the signal to my toplevel file or move the dcm part
to my toplevel?

TIA,
Frank

 

[Symon]

Hi Frank,
You need to find the name of the net after your synthesis process. So, run
Translate, and open the Floorplanner that's listed alongside in the process
window of navigator. Look for your DCM, and find the net name you want. Then
edit you UCF file to match. I'm guessing that:-
NET "*brefclk_ibufg" TNM_NET = brefclk;
would work!
Cheers, Syms.

 

[Frank van Eijkelenburg]

Symon,

thanks for the tip. I can not run the floorplanner, because the translate
process is generating the error, but your suggestion about the name did
work.

Frank

"Symon" <symon_brewer@hotmail.com> wrote in message
news:c75rjp$1fhv$1@ID-212844.news.uni-berlin.de...

Hi Frank,
You need to find the name of the net after your synthesis process. So, run
Translate, and open the Floorplanner that's listed alongside in the
process
window of navigator. Look for your DCM, and find the net name you want.
Then
edit you UCF file to match. I'm guessing that:-
NET "*brefclk_ibufg" TNM_NET = brefclk;
would work!
Cheers, Syms.

 

[Symon]

My pleasure! I forgot to point out, you have to remove the contraint(s) that
caused the error when you run the translate first time. When you've found
the name, you can put the constraint back in!
Cheers, Syms.
"Frank van Eijkelenburg" <someone@work.com> wrote in message
news:409731b9$0$67512$ee9da40f@news.versatel.net...

Symon,

thanks for the tip. I can not run the floorplanner, because the translate
process is generating the error, but your suggestion about the name did
work.

Frank