[SI-LIST] Re: matching within 1 mil
- From: "Salkow, Steven" <steven.salkow@xxxxxxxx>
- To: jon.n.powell@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 04 Jun 2007 13:30:27 -0700
Hey Jon has the right statement: "matching physical length is NOT the
same as matching electrical length", It's a mute point if your not
compensating for the package delays and the differential delays in the
connector's pin paths.
Also keep in mind that many of the package delays may also be absent
from the IBIS files so a simulation may fool you as well.
Good Luck
Steven Salkow
Lockheed IS&GS
3130 Zanker Rd, San Jose
Ca. 95134
W:(408) 473-4058
steven.salkow@xxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of jon_powell37
Sent: Monday, June 04, 2007 10:47 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: matching within 1 mil
When I see these rules to match within 10 mils (or n mils) I wonder who
much matching is really required in the electrical sims (or other
assumptions). Because I don't believe that matching physical length is
the same as matching electrical length. And the router only does
physical length. So the question is, "how close is electrical length to
physical length". I would be very suprized if the accuracy can be
expected to be better than the line width (call it 5 mils).
So, if we are just making a "easy to understand" rule. Fine.
But if it is a necessary rule. Not fine.
Jon
Disclaimer:
The content of this message is my personal opinion only and although I
am an employee of Intel, the statements I make here in no way represent
Intel's position on the issue, nor am I authorized to speak on behalf of
Intel on this matter.
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