[SI-LIST] : IBIS question regards [Falling Waveform] / [Rising Waveform].

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From: Merav Kass (merav.kass@intel.com)
Date: Tue Apr 11 2000 - 12:35:28 PDT


My question regards: [Falling Waveform] / [Rising Waveform].

Our I/O buffer, output stage, contains the following structure:
 <<...>>
while performing a rising transient on the pad , the ndrv signal
"brakes"
before the pdrv "mates".
This cause a strange wave on the pad while simulating a [Rising
Waveform]
with R_fixture (resistor) connected to Vcc:
The PAD begin to rise and even get to almost full swing before the Pmos
opens.
This cause a steepest slope of the [Rising Waveform] while simulating
R_fixture connected to ground rather than R_fixture connected to Vcc .

Waves forms:
 <<...>>

Is this kind of wave is "harmful" to the IBIS model users? should I omit
it,
and leave only the [Rising Waveform] with resistor connected to ground ?

Thanks,
        Merav.

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