[PCB_FORUM] Re: Diff pair separation.
- From: Michael.Catrambone@xxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Tue, 18 Jan 2005 17:24:53 -0600
Steve,
For each of your diff pairs you must specify the Min Line Spacing
field in CM with the same value as your diff pair spacing.
This setting is a replacement for the old Diff_Pair_Overide variable
used in previous versions.
Hope this helps,
Michael Catrambone
UTStarcom, Inc.
"steve kingdon" <steve.kingdon
01/18/2005 05:03 PM
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Subject: [PCB_FORUM] Diff pair separation.
Hi there,
A "while" ago I used to be able to assign a net spacing type to diff
pairs which would keep the pairs apart, while allowing the primary gap
to be maintained.
I have assigned a net spacing type to all signals in my diff pair bus,
and find that I get line-line violations within the pairs, it is looking
for 40mil sep, which is the value I wanted for the pair to pair sep. Has
the way Allegro handles this changed, or has it been too long since I
did this last? I set up diff pairs in CM, on 15.2 s036.
I recall this came up a few months ago....
Cheers
Steve
---------------------------------------------------------------------------------
Steve Kingdon PCB Design Engineer
Allied Telesyn Research Level 2, 445 New North Rd
ph. 64 9 815 9824 Kingsland, Auckland
email: steve.kingdon@xxxxxxxxxxxxxxxxxxx
web: http://www.alliedtelesyn.co.nz/
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