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18 Intel Server Board S845WD1-E Product Guide
Legacy USB Support
Legacy USB support enables USB devices such as keyboard, mice, and hubs to be used even when
the operating system’s USB drivers are not yet 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.
The S845WD1-E server board has four USB 1.1 ports; one USB peripheral can be connected to
each port. For more than four USB devices, an external hub can be connected to any of the ports.
Two of the USB ports are implemented with stacked back panel connectors; the other two are
accessible via the front panel USB header. The S845WD1-E server board fully supports UHCI and
uses UHCI-compatible software drivers.
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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 shielded cable that meets the requirements for full-speed devices.
Legacy USB support operates as follows:
1. When the user applies power to the computer, legacy support is disabled.
2. POST begins.
3. Legacy USB support is enabled by the BIOS allowing the user to use a USB keyboard to enter
and configure the BIOS Setup program and the maintenance menu.
4. POST completes.
5. The operating system loads. While the operating system is loading, USB keyboard and mice are
recognized and may be used to configure the operating system. (Keyboard and mice are not
recognized during this period if Legacy USB support was set to Disabled in the BIOS Setup
program.)
6. After the operating system loads the USB drivers, all legacy and non-legacy USB devices are
recognized by the operating system, and Legacy USB support from the BIOS is no longer used.
To install an operating system that supports USB, verify that Legacy USB support in the BIOS
Setup program is set to Enabled and follow the operating system’s installation instructions.
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NOTE
Legacy USB support is for keyboard, mice, and hubs only. Other USB
devices are not supported in legacy mode.