Table 3 Support Signals For Expresscard; Figure 6 Pci Express: Expresscard Example - Emerson COM Express Carrier Design Manual

COM Express includes four signals that are designated for the support of two ExpressCard slots.

Table 3 Support Signals for ExpressCard

Figure 6 PCI Express: ExpressCard Example

Figure 6 shows an ExpressCard implementation. The example shows COM Express PCIe lane 2 and USB
port 1 used, but other assignments may be made depending on module capabilities and the system
configuration.
Nets PCIE_TX2+ and PCIE_TX2- are sourced from the COM Express module. These lines drive the PCIe
receivers on the ExpressCard. No coupling capacitors are required on the carrier board. These lines are
capacitively coupled on the COM Express module.
COM Express Carrier Type 2
Design Guide
Page 25 of 103