Intel D845GVFN Product Specification - Page 26

IDE Interfaces - audio drivers

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Intel Desktop Board D845GVFN 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 Obtaining the Zone Rendering white paper Refer to http://developer.intel.com/design/chipsets/845gv/ 1.8.2 USB The board supports up to four USB 2.0 ports, fully supports UHCI and EHCI, and uses UHCI- and EHCI-compatible drivers. For more than four 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 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. 26

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Intel Desktop Board D845GVFN Technical Product Specification
26
•
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
1.8.2
USB
The board supports up to four USB 2.0 ports, fully supports UHCI and EHCI, and uses UHCI- and
EHCI-compatible drivers.
For more than four 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 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.