[IBIS] How to model current interfaces like SWP ?

Hello IBIS gurus,

we need some information how to model a current
interface (SWP, single wire protocol).
The problem is, that there is nearby no voltage
swing at the driver output. Only the amount of
current is switching. The IBIS waveforms
support only voltage waveforms. How can we
model current waveforms?

Thanks,

Christian & Matthias.

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