MM,
A more subtle point is how to compare Vpad below with measurements such as
VinL and VinH. There is a simple answer if [GND Clamp Ref]=0.
VinL options
1. Vpad- gnd_clamp_ref
2. (Vpad-gnd_clamp_ref)*( power_clamp_ref-gnd_clamp_ref)/[POWER
Clamp Reference]
VinH could be more challenging, here are some options
1. Vpad-gnd_clamp_ref
2. (Vpad-gnd_clamp_ref)*( power_clamp_ref-gnd_clamp_ref)/[POWER
Clamp Reference]
3. [POWER Clamp Reference]-(power_clamp_ref-Vpad)
I will leave it to Bob to describe how to compare Vpad to thresholds for a
DIA for devices when [POWER Clamp Reference] != 0, [GND Clamp Reference]
!= 0, [Pullup Reference] !=0 , [Pulldown Reference] != 0 and when
pullup_ref != [Pullup Reference ]!= and power_clamp_ref != [POWER Clamp
Reference] and pulldown_ref != [Pulldown Reference] and
gnd_clamp_ref!=[GND Clamp Reference]
Walter
From: Walter Katz [mailto:wkatz@xxxxxxxxxx] ;
Sent: Friday, March 25, 2016 12:59 PM
To: ibis-editorial@xxxxxxxxxxxxx
Subject: RE: [ibis-editorial] Updated Terminal Names Table
MM,
To clarify your question on DUT vs DIA; I will explain it separately for
the [Power Clamp] and [GND Clamp] IV Tables.
All voltages are relative to a simulator reference Node (e.g. 0, but does
not need to be 0).
Vpad is the voltage at the I/O pad
Vtable is the voltage used in the IV table in the IBIS file
[GND Clamp Reference] is the voltage used to make the [GND Clamp] IV
Table.
[POWER Clamp Reference] is the voltage used to make the [POWER Clamp] IV
Table.
gnd_clamp_ref is the rail voltage actually supplied to the device GND
Clamp Circuit.
power_clamp_ref is the rail voltage actually supplied to the device POWER
Clamp Circuit.
For [GND Clamp] ("VSS Relative")
DUT Vtable=Vpad-[GND Clamp Reference]
DIA Vtable=Vpad- gnd_clamp_ref
For [POWER Clamp] ("VCC" Relative)
DUT Vtable= [POWER Clamp Reference]-Vpad
DIA Vtable= power_clamp_ref-Vpad
Walter
-----Original Message-----
From: ibis-editorial-bounce@xxxxxxxxxxxxx
<mailto:ibis-editorial-bounce@xxxxxxxxxxxxx>
[mailto:ibis-editorial-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Ross
Sent: Friday, March 25, 2016 12:28 PM
To: ibis-editorial@xxxxxxxxxxxxx <mailto:ibis-editorial@xxxxxxxxxxxxx>
Subject: [ibis-editorial] Updated Terminal Names Table
All,
Updated terminal Names table I showed at the 3/25/16 meeting attached and
for uploading.
Bob
--
Bob Ross
Teraspeed Labs
<http://www.teraspeedlabs.com> http://www.teraspeedlabs.com
<mailto:bob@xxxxxxxxxxxxxxxxx> bob@xxxxxxxxxxxxxxxxx
Direct: 503-246-8048
Office: 971-279-5325
