Server Board Features
19
USB
High-Speed USB 2.0 Support
✏
NOTES
Use a shielded cable that meets the requirements for a full-speed USB
device. Computer systems that have an unshielded cable attached to a USB
port might not meet FCC Class B requirements, even if no device or a low-
speed USB device is attached to the cable.
USB devices are limited to USB 1.1 transfer rates prior to operating system
and driver initialization.
The server board supports up to six USB 2.0 ports via the ICH5. Four ports are routed to the back
panel. One header, supporting up to two ports, is routed to the front panel. USB 2.0 ports are
backward compatible with USB 1.1 devices. USB 1.1 devices will function normally at USB 1.1
speeds.
USB 2.0 support requires both an operating system and drivers that fully support USB 2.0 transfer
rates. Disabling High-Speed USB in BIOS reverts all USB 2.0 ports to USB 1.1 operation. This
may be required to accommodate operating systems that do not support USB 2.0.
Legacy USB Support
Legacy USB support allows USB devices such as keyboard, mice, and hubs to be used even when
the operating system’s USB drivers are not available. Legacy USB support is used to access the
BIOS Setup program, and to install an operating system that supports USB. By default, Legacy
USB support is set to Enabled.
Four of the USB ports are implemented with stacked back panel connectors; the other two are
accessible via the front panel USB header. The S875WP1-E server board fully supports UHCI and
uses UHCI-compatible software drivers.
✏
NOTE
Computer systems that have an unshielded cable attached to a USB port may not
meet FCC Class B requirements, even if no device is attached to the cable. Use
s shielded cable that meets the requirements for full-speed devices.
