ADLINK cPCI-6615 - Manual (Page 59)

Getting Started 45
cPCI-6615
5.5 PCI Mezzanine Card Installation
The PMC slot on the cPCI-6615 is designed to support 3.3V.
Please contact ADLINK for 5V signalling support.
1. Before installing a PMC module, keep the V(I/O) keying
pin in place for module with 3.3V signaling.
3.3V keying pin