[PCB_FORUM] Length Matching - was: RE: Re: RE : SPAM!!! capture to allegro trouble

Hi Peter,

> I have a problem. I have not posted on the forum yet. Maybe you can help.
> For some reason I cannot remember how to set up trace length matching.
What
> I have is a test board. All sockets. I have 4 JTAG lines that go to each
> one. I need to match them within 300 mils only to each socket. I set them
up
> in Constraint Manager as groups. Here is a snapshot of it.

You need to set the up as length match groups (which will probably be
pinpairs in your case), one group to each socket, then assign the tolerance
to each group.

But, a bigger question, at least to me, is where did you come up with this
300 mil requirement?  That'as a 60ps length match, and I've never heard of
a JTAG grouping needing any real length matching, much less one that tight.
To within a few inches should be just fine in my experience.

Regards,

Austin


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