Intel D845GVSR D845GVSRL ユーザーズマニュアル

製品コード

D845GVSRL

Intel Desktop Board D845GVSR Technical Product Specification

•  Increased headroom for larger resolution and color depth
•  Reduced power as a result of decreased memory bandwidth
•  Reduction in depth and color bandwidth associated with conventional rendering

For information about

Refer to

Obtaining the Zone Rendering white paper

http://developer.intel.com/design/chipsets/845gv/

1.8.2 USB

The board supports up to six USB 2.0 ports, fully supports UHCI and EHCI, and uses UHCI- and
EHCI-compatible drivers. For more than six USB devices, an external hub can be connected to
any of the ports.

The ICH4 provides the USB controller for all ports. The port arrangement is as follows:
• Two ports are implemented with stacked back panel connectors, adjacent to the PS/2

connectors

• Two ports are implemented with stacked back panel connectors, adjacent to the audio

connectors

• Two ports are routed to the front panel USB connector

✏

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.

1.8.3 IDE

Interfaces

The ICH4’s IDE controller has two independent bus-mastering IDE interfaces that can be
independently enabled. The IDE interfaces support the following modes:
•  Programmed I/O (PIO): processor controls data transfer.
•  8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/sec.
•  Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer rates

of up to 33 MB/sec.

• ATA-66: DMA protocol on IDE bus supporting host and target throttling and transfer rates of

up to 66 MB/sec. ATA-66 protocol is similar to Ultra DMA and is device driver compatible.

• ATA-100: DMA protocol on IDE bus allows host and target throttling. The ICH4’s ATA-100

logic can achieve transfer rates up to 100 MB/sec.