Kontron COMe-cTH6 - Manual (Page 31)

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COMe-cTH6 User’s Guide
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5 COMe-cTH6 Interfaces
5.1 PCI Express Interface
The PCI Express* GEN 2.0 general purpose lanes provide a fast connection interface for many different system
devices, such as network controllers, I/O controllers, or express card devices. The implementation of this subsystem
complies with the COM Express Specification. Refer to the PICMG COM Express® Design Guide for additional
implementation information.
The COMe-cTH6 COM supports up to seven general purpose PCI Express lanes; four lanes from the CPU, software-
configurable as x4, x2, or x1, and three additional PCIe lanes from the FCH, software-configurable as 3 x1 or 1 x1 and
1 x2.
5.2 USB Interface
The USB interface supports both USB 2.0 and USB 3.0 (new with COM Express Type 6).
5.2.1 USB 2.0 Interface
Eight high-speed USB 2.0 ports are brought from the Fusion Control Hub to the COM Express A-B connector. The FCH
uses two EHCI controllers with one serving five COM Express ports (0 – 4) and one serving three COM Express ports (5
– 7).
Figure 5 shows how the eight USB 2.0 ports are mapped in the COMe-cTH6 module.
5.2.2 USB 3.0 Interface
Four super speed USB 3.0 ports are brought from the Fusion Control Hub to COM Express connector C-D, USB
connector USB_SS (3:0).
Note: AMD advises adding a provision for a 300-Ω resistor and 15-pF capacitor to ground on each USB negative data
signal that goes to an external USB connector or to any internal USB 2.0 isochronous device. The resistor and
capacitor should be located as close as possible to the USB device or connector. See AMD documentation for more
details.
Error! Reference source not found. shows the internal USB 3.0 mapping from the AMD FCH.
DRAFT COPY FOR REVIEW ONLY
DRAFT COPY FOR REVIEW ONLY