[IBIS] question about the [Composite Current] table

Hi IBIS experts,

I have the basic question about the [Composite Current] table of IBIS5 model.

The ibis5.1 syntax explains the [Composite Current] as follows.

Keyword: [Composite Current]

Required: No
Description: Describes the shape of the rising and falling edge current waveforms from the power reference terminal of the buffer.

And the circuit image is attached file.

So I understood as follows.

The ibis5 model can consider the Bounce of V(vdd,vss) because of the current "vdd -> pch -> R_fix -> gnd".
But the ibis5 model CAN'T consider the Bounce of V(vdd,vss) because of the current "V_fix -> R_fix -> nch -> gnd".

Is my understanding correct ?

Regards,
Ryohei Kato

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