[SI-LIST] Re: AW: Question Regarding Some IBIS Parameters
- From: "Timothy Coyle" <Timothy.Coyle@xxxxxxx>
- To: eckhard.lenski <eckhard.lenski@xxxxxxxxxxx>
- Date: Thu, 17 Oct 2002 08:21:36 -0400
Hello Eckhard,
Thank you for your response. I was asking about the pin mapping. From the
other responses I've received, I gather I just
need to define the same ground and power for the appropriate sets of IO
pins.
Regards,
Tim
|---------+---------------------------->
| | eckhard.lenski@si|
| | emens.com |
| | |
| | 10/17/2002 05:59 |
| | AM |
| | |
|---------+---------------------------->
>------------------------------------------------------------------------------------------------------------------------------|
|
|
| To: Timothy Coyle/Americas/NSC@NSC,
si-list@xxxxxxxxxxxxx@Internet |
| cc:
|
| Subject: [SI-LIST] AW: Question Regarding Some IBIS Parameters
|
>------------------------------------------------------------------------------------------------------------------------------|
Hello Timothy,=20
let's start with over-undershoot:
IBIS-Definition:
| The static overshoot subparameters provide the DC =
voltage
| values for which the model is no longer guaranteed to =
function
| correctly. Typically these are voltages that would =
cause the
| physical component to be destroyed.
|
|
| The dynamic overshoot values provide a time window =
during
| which the overshoot may exceed the static overshoot =
limits
| but be below the dynamic overshoot limits. =
D_overshoot_time
| is required for dynamic overshoot testing. In =
addition, if
| D_overshoot_high is specified, then S_overshoot_high is
| necessary for testing beyond the static limit. =
Similarly, if
| D_overshoot_low is specified, then S_overshoot_low is
| necessary for testing beyond the static limit.
The tools are using these parameters to give the desingn engineer =
information, whether something in his layout is not okay. e.g. when =
there is a to big undershoot he might use a series resistor to avoid =
this undershoot.
Reference for power-clamp and gnd-clamp
-there exists input/outputs, where the protection diode is using =
another suply voltage than the IO. e.g. the IO is working with 3p3V, =
but the power-diode is connected to a vcc of 5V. so in this case the =
pullup-reference will be 3.3v , but the power-clamp-reference is 5v.
And I don't understand your first question.
Are you just asking for the pinning ( PIN-keyword ) or for the pin =
mapping ( which tells you, which IOs or IO groups do belong to a common =
gnd or vcc pin) ?
Regards
Eckhard
Eckhard Lenski
Siemens AG
ICN WN OP TDC TC3
Phone : 0049 89 722 27776
Fax : 0049 89 722 44692
Email : eckhard.lenski@xxxxxxxxxxx
-----Urspr=FCngliche Nachricht-----
Von: Timothy Coyle [mailto:Timothy.Coyle@xxxxxxx]
Gesendet: Mittwoch, 16. Oktober 2002 21:35
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Question Regarding Some IBIS Parameters
Hi,
I am trying to find some information on how I should define my pin =
mapping
in my IBIS file. Do I just declare an arbitrarily named ground and =
power
buses
for my pins? If the pulldown_ref and pullup_ref are for the ground and
power, what are the gnd_clamp_ref and power_clamp_ref for?
Also, what are the benefits of including static and dynamic overshoot
values for Model Spec? How do simulators such as XTK and SpecctraQuest =
use
these values?
Regards,
Tim
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages=20
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
