Re: Egg 9 (diode turn on/off)

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Hi Diode gurues,

I don't 100 % agree with Kellee with his statement that it does not matter which
way the capacitor is connected. As he rightly stated it, it does make a
difference to the currents flowing in the power pins. Now, there are provisions
in IBIS that ground and power bounce are possible to simulate. Therefore, the
current of the capacitor should go through the appropriate GND or power pin to
make the bounce simulation more accurate. This is one of the reasons that we
went through all the pain to get everyone think in Vcc relative terms for the
pullups... Let's not ruin it now with a simplification like this.

Arpad
================================================================================

Bob, I really like your egg. I was the one pushing this thing
a year ago, I am very glad you have become the champion for it.

Steven, it shouldn't matter from a black box approach if the
capacitor goes to ground or power from the position of the
output pin. It does make a difference to the currents flowing
in the power pin itself. It seems to me it would be acceptable to
model it either way if desired.

My only major concern about the egg is:
 The equation for computing the capacitance based on the forward current
 should be included in the text before it becomes a birdy. This way
 everyone will use the same equation, or at least know which equation
 is suggested by the IBIS group.

Have a great day...Kellee Crisafulli, HyperLynx Inc.

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Subject: Egg 9 (diode turn on/off)
From: Kellee Crisafulli <kellee@hyperlynx.com>
To: ibis@vhdl.org
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