Including submodel selection keyword in IBIS model
Hi SI users,
We have been generating IBIS models for DDR2 memory and have always come across
Of including multiple ODT options for IOs. If we can include "submodel
selection" option in the IBIS model,
It would be possible to provide multiple ODT options in a single IO IBIS model
rather than creating the separate IO model to incorporate
Thanks and Regards,
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Brijesh.Shah 5 years 3 months 23 days
The best answer
You can select the best answer for current question!
Answered bykeeyoung.kwon 5 years 3 months 23 days
I think you've been generating ODT models through power/ground clamp (V/I)
without submodel selection.
In this case, it will need different power/ground clamp curves for each ODT
As you mentioned, it looks nice to adopt single I/O model with simple submodels.
But, even if you select [add submodel] for an ODT, it will need separately
dynamic clamps in the end of IBIS for each ODT cases.
I don't know which one is simple to describe ODT. I think it depends on a work
process using spice2IBIS for the schematics.
Whatever you select, it will not matter to SI users if their simulator handles
model selector correctly.
Answered byBrijesh.Shah 5 years 3 months 23 days
It does, but when I have an IO pad with 5 ODT options. I have to make 5
different IO models, each with one ODT submodel.
If we have submodel selection, we can do it all in one IO model.
Answered bybuenoshun 5 years 3 months 23 days
Does the "model selector" that we select in the simulator not serve this
Normally we select the ODT option with that.