[SI-LIST] : length constraints in Specctraquest

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From: Aloke Bhattacharya ([email protected])
Date: Mon Sep 04 2000 - 05:40:20 PDT

 I have a simple topology like this:

Driver ------TL1---------/\/\/\/\-------TL2----------Receiver

The driver is connected to the receiver through a 33ohm series
termination resistor. This Xnet is a part of
a group of source synchronous signals and I need to apply the following
constraints to the above topology in Sigxp:
(i) the length of (TL1+TL2) has to match across all the signals within
50 mils.
(ii)TL1+TL2 length should be between 1 inch and 6 inches

In the set constraints menu of Sigxp, I don't see any option of applying
delay or matched delay constraints
to the sum of lengths of two or more transmission lines. Currently I am
able to apply the delay or the matched delay constraint to only a single
segment of a transmission line(like TL1 or TL2 in the above diagram).
Does anybody know how to assign such a constraint in Sigxp? If it is not
possible to assign it in Sigxp, is it possible to do it in Allegro?

With regards,

* Aloke Bhattacharya,                                                *
* Senior Engineer-VLSI/System Design,
*                    *
* Wipro Infotech,                                                    *
* Global R&D,                                                        *
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* email: [email protected]
*                                            *

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