Intel D845GRG Technical Product Specification for Intel Desktop Boards using t - Page 26

IDE Support - audio driver

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Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset 1.7.2 USB The Desktop Boards support up to six USB 2.0 ports, fully support UHCI and EHCI, and use 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. ✏ NOTE USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not currently supported by any other operating system. 1.7.3 IDE Support 1.7.3.1 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. # INTEGRATOR'S NOTE ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce reflections, noise, and inductive coupling. The IDE interfaces also support ATAPI devices (such as CD-ROM drives) and ATA devices. The BIOS supports 48-bit Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes. The drive reports the transfer rate and translation mode to the BIOS. 26

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Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
26
1.7.2
USB
The Desktop Boards support up to six USB 2.0 ports, fully support UHCI and EHCI, and use
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.
✏
NOTE
USB 2.0 support has been tested with Windows 2000 and Windows XP drivers and is not currently
supported by any other operating system.
1.7.3
IDE Support
1.7.3.1
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.
#
INTEGRATOR
’
S NOTE
ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce reflections,
noise, and inductive coupling.
The IDE interfaces also support ATAPI devices (such as CD-ROM drives) and ATA devices.
The BIOS supports 48-bit Logical Block Addressing (LBA) and Extended Cylinder Head Sector
(ECHS) translation modes.
The drive reports the transfer rate and translation mode to the BIOS.