IEI Integration ICE-DB-9S - Manual (Page 55)

ICE Module
Page 42
23 GND P Ground
24 PETn0 I/O PCIe PCI Express Transmitter differential pair negative signal
25 PETp0 I/O PCIe PCI Express Transmitter differential pair positive signal
26 GND P Ground
The PCMCIA Consortium defines two form factors for Express Cards:
Express Card/34 and Express Card/54 use a socket-style interconnect.
There are two mechanical Form Factors with Express Card/34, which
are useable in either socket. Each has the same electrical interface.
Interface support for a PCIe x1 lane and USB 2.0 on the socket is
required.
Socket interface requirements for Carrier Boards include:
PCIe x1 Lane and USB 2.0
WAKE# and the SM Bus are optional at the socket and COM Express
Module level.
Figure 4-7: Express Card 54&34 Type (Refer to www.expresscard.org )