[IBIS] Bush Hold and Enable node

Hi expert,

  Is there any relation between the transition of Bush Hold submodel and
the shift of enable->disable of top model? I failed to find the relation
in IBIS4.1.

  I think the transition of Bush Hold is only related to Vdie,
disregarding whether or not top buffer is disable. Is it right?
  
Many thanks
Xuefeng
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