Product Description
21
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
• One of the following:
⎯ Intel 82801GR I/O Controller Hub (ICH7-R) with DMI interconnect
⎯ Intel 82801GH I/O Controller Hub (ICH7-DH) 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/ICH7-DH 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 connectors
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 18, page 57
The location of the front panel USB connectors Figure 19, page 58
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