[SI-LIST] Re: PCI-X Specification! - or meaning of overshoot?
- From: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 6 Dec 2001 09:34:35 -0800
Fred Balistreri sent me a good comment in a private
message, and I feel it should be posted here with my
response.
Fred,
You are right, I was just thinking too old fashioned when
signals went supply rail to supply rail.
It really should be with respect to Vol, and Voh, or in some
cases Vtt, etc...
Arpad
============================================================
-----Original Message-----
From: Fred Balistreri [mailto:fred@xxxxxxxxxxxxx]
Sent: Thursday, December 06, 2001 8:47 AM
To: arpad.muranyi@xxxxxxxxx
Subject: Re: [SI-LIST] Re: PCI-X Specification! - or meaning of
overshoot?
Hello Arpad, in your opinion should over/under shoot be specified
by the rail voltage or max/min vol, voh values? The rail works
for traditional push/pull CMOS. But what about TTL, ECL, GTL and
others?
Best Regards,
============================================================
-----Original Message-----
From: Muranyi, Arpad
Sent: Thursday, December 06, 2001 8:36 AM
To: si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] PCI-X Specification! - or meaning of overshoot?
Regarding the definition of overshoot...
Another favorite point I like to pick on is that many refer
to a waveform that reaches 6 volts in a 5 volt system as a 6 V
overshoot without ever mentioning what the rail voltage is!
In in reality this waveform went only 1 volt above the rail
voltage, that is, the overshoot was only 1 V, not 6 V! So
either include the rail voltage in your report if you are
referring to the absolute voltage of 6 volts or call it a
(rail voltage relative) 1 volt overshoot...
Arpad Muranyi
Intel Corporation
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