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PCI under reset



   I have a question on the PCI spec.
The spec says that "To prevent AD, C/BE#, and PAR signals from floating
during reset, the central resource may drive these line during reset (bus
parking) but only to a logic low level; they may not be driven high."
   What is the reason? 
   What if these signals are toggled for a few micro seconds while the reset
is active?

Thanks in advance,
Michael