From: Stubbs, Jason ([email protected])
Date: Wed Dec 20 2000 - 09:49:12 PST
I'm trying to route a signal from one source to three loads with a timing
constraint of a+0.1 for all source to load traces.
If the parts are placed as shown below, the synthesis (Star topology)
provides expected results:
|\
_| \
| | /L1
| |/
|
|\ | |\
| \_______________________|________| \
| /S | | /L2
|/ | |/
|
| |\
|_| \
| /L3
|/
The S-L1, S-L2 & S-L3 delays meet the timing constraints. However, if the
loads are repositioned as shown below, something unexpected happens:
|\
___| \
| | /L1
| |/
|
|\ | |\
| \____________________________|___| \
| /S | | /L2
|/ | |/
|
| |\
|___| \
| /L3
|/
I would have expected to see a meander trace added to the stub of L2 to
match the delay of L1 & L3, but there isn't. This causes a timing error.
I can't move the components, so are there any other options. Please don't
say manually route the traces!
Jason Stubbs
Marconi Communications
www.marconi.com
BXR 48000 Hardware Group
Tel: 724-742-6150
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