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20 Intel Server Board S875WP1-E Product Guide
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 is 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.
✏
NOTE
Legacy USB support is for keyboard, mice, and hubs only. Other USB
devices are not supported in legacy mode.
PCI I/O Subsystem
The primary I/O bus for the server board S875WP1-E is PCI, with one independent PCI bus. The
PCI bus complies with the PCI Local Bus Specification, Rev 2.3. The PCI bus is directed through
the Intel 82801EB I/O Controller Hub (ICH5-R). The table below lists the characteristics of the
PCI bus.
Table 4. PCI Bus Characteristics
Voltage Width Speed Type Comments
5 V 32-bits 33 MHz Independent Bus Supports full-length cards
32-bit, 33-MHz PCI Subsystem
All 32-bit, 33-MHz PCI I/O for the server board S875WP1-E is directed through the Intel 82801EB
I/O Controller Hub (ICH5-R). The PCI bus supports the following embedded devices and
connectors:
• 2D/3D Graphics Accelerator: ATI Rage XL Video Controller.
• Serial ATA-100 controller: Promise Technology PDC20319.
• Three PCI slots
Each of the embedded devices listed above, with exception to the Ultra DMA 33 / ATA 100/66
connectors, will be allocated a GPIO to disable the device.