Ide Support - Intel D845EPT2 Specification

1.8.3 IDE Support

1.8.3.1 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 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 106.
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 Desktop Boards D845EBG2 and D845EPT2 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
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
Product Description
Refer to
Figure 13, page 63
Table 38, page 69
Table 75, page 115
Refer to
Figure 13, page 63 or Figure 14, page 64
Table 39, page 69
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