[ibis-quality] Re: section 7
- From: "Mike LaBonte (milabont)" <milabont@xxxxxxxxx>
- To: "David Banas" <david.banas@xxxxxxxxxx>, "Muniswara Reddy Vorugu" <Muniswarareddy.Vorugu@xxxxxxx>
- Date: Wed, 18 Feb 2009 12:02:29 -0500
I also agree with Muniswara, and would prefer to use the full swing
range as the basis. This is what the receiver has available to
discriminate the received logic level.
Mike
________________________________
From: David Banas [mailto:david.banas@xxxxxxxxxx]
Sent: Wednesday, February 18, 2009 11:54 AM
To: Muniswara Reddy Vorugu; Mike LaBonte (milabont)
Cc: ibis-quality@xxxxxxxxxxxxx
Subject: RE: [ibis-quality] Re: section 7
You know, several people inside Xilinx have made the same comment. The
more I think about it, the more I'm convinced that what you're proposing
is a better way. Perhaps we should discuss this in committee?
-db
________________________________
From: Muniswara Reddy Vorugu [mailto:Muniswarareddy.Vorugu@xxxxxxx]
Sent: Tuesday, February 17, 2009 8:38 PM
To: David Banas; Mike LaBonte (milabont)
Cc: ibis-quality@xxxxxxxxxxxxx
Subject: RE: [ibis-quality] Re: section 7
Hi Banas,
From Err = (IBIS - Spice) / Spice
This metric for Low level is pessimistic compared to High level,
Particularly in Full swing I/O like GPIOs.
I will explain it with an example.
Logic level
IBIS
SPICE
Absolute ERR
Relative to VDD
Relative Err
Vlow_level
0.11
0. 1
0.01
0.003
0.1
Vhigh_level
3.31
3.30
0.01
0.003
0.003
In this example, for same Absolute error of 0.01V, low level has
relative error of 0.1 while high level have 0.003.
I feel, the metric for Low_level and High levels should be absolute
terms, or relative to Swing/Supply.
Thanks
Muniswara
From: ibis-quality-bounce@xxxxxxxxxxxxx
[mailto:ibis-quality-bounce@xxxxxxxxxxxxx] On Behalf Of David Banas
Sent: Wednesday, February 18, 2009 1:49 AM
To: Mike LaBonte (milabont)
Cc: ibis-quality@xxxxxxxxxxxxx
Subject: [ibis-quality] Re: section 7
Here you go, Mike.
-db
________________________________
From: Mike LaBonte (milabont) [mailto:milabont@xxxxxxxxx]
Sent: Tuesday, February 17, 2009 10:46 AM
To: David Banas
Subject: section 7
Hi David,
For some crazy reason I can't find the email you sent about IQ section
7. Could you resend?
Mike
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