[SI-LIST] How V-T table been extracted for IBIS model
- From: ZHENGZHIWEI <zhiweizh@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 13 May 2011 15:07:47 +0800 (CST)
Hello Expert,
From "ibis modeling cookbook for ibis-v4", four V-= T tables recommended:
[Falling Waveform] Pulldown turning on (Resistor t= o Vcc)
[Rising Waveform] Pulldown turning off (Resistor to Vcc)
[Risi= ng Waveform] Pullup turning on (Resistor to GND)
[Falling Waveform] Pull= up turning off (Resistor to GND)
I have some questions for this.&nbs= p;
Say, the first case, falling waveform with terminator connect to Vcc.= It
only mention about Pulldown transistor turning on. What is the status o= f
Pullup transistor, is it trunning off or keeping off? There are some docs=
point out that "real devices have slightly different switching characteris=
tics", " turnning off is a little earlier than turnning on". But there stil=
l has overlap.
Similar question came from "Under ideal conditions, no cu= rrent will flow
through the pulldown transistor" in the 62 page in the cook= book. It is a
rising waveform with terminator connect to GND. I think there= has current
flow through pulldown transistor in the turnning overlap time.=
Am I misunderstand?
thanks!
steve.
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