[SI-LIST] : Unexpected result with ICX IS

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From: Stubbs, Jason (Jason.Stubbs@marconi.com)
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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