[PCB_FORUM] Re: Difference between "delta" and "tolerance" in Relative Propagation Delay
- From: "Julian Ungureanu (jungurea)" <jungurea@xxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Sat, 12 Mar 2005 07:17:19 -0800
Austin,
I believe Delta is meant to be used when you have a say bus and you attached
a match length
Group; you include in your group the clock that goes along with the data bus
let's say.
You want the clock to be skewed by 1" say. So all the nets are part of that
matched group, included the clock; but the clock has Delta of 1".
The whole group has a tolerance of 100 mils.
My 2 cents,
Julian
-----Original Message-----
From: Austin Franklin [mailto:austin@xxxxxxxxxxxx]
Sent: Friday, March 11, 2005 7:39 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Difference between "delta" and "tolerance" in Relative
Propagation Delay
Hi,
What is the functional difference between "delta" and "tolerance" in the
constraint manager "relative propagation delay" worksheet? The examples
(and explanations) they give seem like they could be implemented with
either...
For example:
three signals A, B, C. Say C is target of 1", and I want a length match of
.1 on A & B to C. I could set either delta OR tolerance to .1, and get what
I want.
Again, three signals, A, B, C. C target of 1". I set delta to .1, and
tolerance to 10 mils. What is different doing that than simply setting
either delta or tolerance to 110?
Regards,
Austin
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