Pinout for PCI express

Started by roymesi, May 03, 2005, 15:21

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roymesi

Hi,
I saw in some sites, that regarding the detailed pinout for the PCI-express architecture, there's reference for 2 sides, A and B.
I would like to know to whom do they refer by saying - side A and side B of the connector.
For instance, which side is the mother board defined? Aide A or B?
Thanks,
Roy