Intel S975XBX2 - Workstation Board Motherboard, Specification, Page: 24 / 102

Intel Workstation Board S975XBX2 Technical Product Specification
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1.5 Intel
®
975X Chipset
The Intel 975X chipset consists of the following devices:
• Intel 82975X Memory Controller Hub (MCH) with Direct Media Interface (DMI)
interconnect
• Intel 82801GR I/O Controller Hub (ICH7-R) with DMI interconnect
The MCH is a centralized controller for the system bus, the memory bus, the PCI
Express bus, and the DMI interconnect. The ICH7 is a centralized controller for the
board’s I/O paths. The BIOS code is stored in the Serial Peripheral Interface (SPI)
Flash device.
For information about Refer to
The Intel 975X chipset http://developer.intel.com/
Resources used by the chipset Chapter 2
1.5.1 USB
The board supports up to eight USB 2.0 ports, supports UHCI and EHCI, and uses
UHCI- and EHCI-compatible drivers.
The ICH7-R provides the USB controller for all ports. The port arrangement is as
follows:
• Four ports are implemented with dual stacked back panel connectors adjacent to
the audio connectors
• Four ports are routed to two separate front panel USB headers
NOTES
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.
For information about Refer to
The location of the USB connectors on the back panel Figure 15, page 55
The location of the front panel USB headers Figure 16, page 56