Intel BOXD845BGSE Product Specification - Page 29

IDE Support

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Product Description 1.8.3 IDE Support 1.8.3.1 IDE Interfaces The ICH2'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 ICH2's ATA-100 logic can achieve read transfer rates up to 100 MB/sec and write transfer rates up to 88 MB/sec. ✏ 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 using the transfer modes listed in Section 4.4.4.1 on page 109. The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes. The drive reports the transfer rate and translation mode to the BIOS. The D845BG and D845PT boards support Laser Servo (LS-120) diskette technology through the IDE interfaces. An LS-120 drive can be configured as a boot device by setting the BIOS Setup program's Boot menu to one of the following: • ARMD-FDD (ATAPI removable media device - floppy disk drive) • ARMD-HDD (ATAPI removable media device - hard disk drive) For information about The location of the IDE connectors The signal names of the IDE connectors BIOS Setup program's Boot menu Refer to Figure 14, page 64 Table 38, page 70 Table 74, page 117 1.8.3.2 SCSI Hard Drive Activity LED Connector The SCSI hard drive activity LED connector is a 1 x 2-pin connector that allows an add-in SCSI controller to use the same LED as the onboard IDE controller. For proper operation, this connector should be wired to the LED output of the add-in SCSI controller. The LED indicates when data is being read from, or written to, both the add-in SCSI controller and the IDE controller. For information about The location of the SCSI hard drive activity LED connector The signal names of the SCSI hard drive activity LED connector Refer to Figure 14, page 64, or Figure 15, page 65 Table 39, page 70 29

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Product Description
29
1.8.3
IDE Support
1.8.3.1
IDE Interfaces
The ICH2
’
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 ICH2
’
s ATA-100
logic can achieve read transfer rates up to 100 MB/sec and write transfer rates up to 88 MB/sec.
✏
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 using
the transfer modes listed in Section 4.4.4.1 on page 109.
The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS)
translation modes.
The drive reports the transfer rate and translation mode to the BIOS.
The D845BG and D845PT boards support Laser Servo (LS-120) diskette technology through the
IDE interfaces.
An LS-120 drive can be configured as a boot device by setting the BIOS Setup
program
’
s Boot menu to one of the following:
•
ARMD-FDD (ATAPI removable media device
–
floppy disk drive)
•
ARMD-HDD (ATAPI removable media device
–
hard disk drive)
For information about
Refer to
The location of the IDE connectors
Figure 14, page 64
The signal names of the IDE connectors
Table 38, page 70
BIOS Setup program
’
s Boot menu
Table 74, page 117
1.8.3.2
SCSI Hard Drive Activity LED Connector
The SCSI hard drive activity LED connector is a 1
x
2-pin connector that allows an add-in
SCSI controller to use the same LED as the onboard IDE controller.
For proper operation, this
connector should be wired to the LED output of the add-in SCSI controller.
The LED indicates
when data is being read from, or written to, both the add-in SCSI controller and the IDE controller.
For information about
Refer to
The location of the SCSI hard drive activity LED connector
Figure 14, page 64, or
Figure 15, page 65
The signal names of the SCSI hard drive activity LED connector
Table 39, page 70