Kontron EPIC/CE, Руководство пользователя

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9 USB Interfaces
Kontron User's Guide EPIC/CE 29
9 USB Interfaces
The EPIC/CE offers 6 USB ports. These ports are driven by three UHCI USB 1.1 controllers or one EHCI
USB 2.0 controller(s). Four of the 6 USB ports are available on the EPIC/CE front and two more ports are
available on internal connectors. You can expand the ports for up to 127 USB peripherals by using
external USB hubs.
9.1 Front Connectors (USB 0 to USB 3)
The four USB interfaces on the front are available through the multi-functional Connectors X5 and X21.
To find the location of the USB connectors, please see the Appendix E: Connector Layout chapter. The
following table shows the pin-out of these USB interfaces.
Header Pin Signal Name Function
1 VCC * USB supply (max. 500mA)
2 USB- USB Port (-)
3 USB+ USB Port (+)
4 GND USB Ground
Notes
: (*) To protect the external power lines of peripheral devices, make sure that:
-- the wires have the right diameter to withstand the maximum available current
-- the enclosure of the peripheral device fulfils the fire-protecting requirements of
-- IEC/EN 60950.
The USB power lines are protected with a resetable fuse and are limited to 500mA.
9.2 Internal Connectors (USB 4 and USB 5)
The two internal USB interfaces are available through the Connectors X20 and X25 (4 pins). The
following table shows the pin-out of these additional USB interfaces.
Header Pin Signal Name Function
1 VCC * USB supply (max. 500mA)
2 USB- USB port (-)
3 USB+ USB port (+)
1
4 GND USB Ground
Notes
: (*) To protect the external power lines of peripheral devices, make sure that:
-- the wires have the right diameter to withstand the maximum available current
-- the enclosure of the peripheral device fulfils the fire-protecting requirements of
-- IEC/EN 60950.
The USB power lines are not protected. An additional resetable fuse is
recommended.