[SI-LIST] pci bus

hello all
   
  I am working on a new project which includes a PCI bus.
   
  I am not familier with this bus and  I will appriciate to get any material or 
links
   
  about SI issues in PCI bus design.
   
  I dont understand the voltage supply to the bus. If i have a 3.3V key it 
means that the
   
  card works with only 3.3V so why to supply 5v to the board?
   
  Thanks in advance
   
  David
       
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