Copyright © 2014 congatec AG
IGX1m02 16/134
3.3
USB Structure
USB Port #
Location
USB Version
USB Controller
USB Fuse
0-3
Rear USB ports
(IO-Shield)
1.1
OHCI 1
common fuse 5V/2A
(see note below)
2.0
EHCI 1
4-7
Pin Header (4,7)
Internal “Stick” Port
(5)
Mini-PCIe (6)
1.1
OHCI 2
common fuse 5V/2A
(see note below)
2.0
EHCI 2
8-9
USB3 Header
(xHCI disabled)
1.1
OHCI 3
common fuse 5V/2A
(see note below)
2.0
EHCI 3
USB3 Header
(xHCI enabled)
1.1
xHCI
2.0
3.0
Note
Specified maximum USB supply current: 0.5A/5V for each USB2.0 port; 0.9A/5V for each USB3.0 port.
Internal USB Cable Length:
USB 2.0:
Board will only support USB specification compliant cables with a maximum length of 12 inches (30.5cm) for USB 2.0. The cables
must have an impedance of 90 ohms. Furthermore, the cables must have a twisted signaling pair for each individual port. That means each
port has two twisted signaling pairs and one GND cable and one power cable in one jacket with inner and outer shield. The shield of the cable
must be connected with the GND of the connector. These cables can be connected to the internal dual channel connector. For further details
see section 6 in the USB 2.0 specification.
USB 3.0: conga-IGX will only support USB 3.0 compliant cables with a maximum length of 16 inches (40.5cm) (internal USB cable to the USB
connector type A). The differential characteristic impedance for the SDP pairs is recommended to be within 90 Ω +/- 7 Ω. USB 3.0 cables have
eight primary conductors: three twisted signal pairs for USB data paths and a power pair. In addition to the twisted signal pair for USB 2.0
data path, two twisted signal pairs are used to provide the SuperSpeed data path, one for the transmit path and one for the receive path. USB
3.0 receptacles (both upstream and downstream) are backward compatible with USB 2.0 connector plugs. USB 3.0 cables and plugs are not
intended to be compatible with USB 2.0 upstream receptacles.
