Ide Support - Intel BLKD865PERL Technical Product Specification

Intel Desktop Board D865PERL Technical Product Specification

1.7.3 IDE Support

The board provides four IDE interface connectors:
•
Two Parallel ATA IDE connectors, which support a total of four devices (two per connector)
•
Two Serial ATA IDE connectors, which support one drive per connector
1.7.3.1 Parallel ATA IDE Interfaces
The ICH5's Parallel ATA IDE controller has two independent bus-mastering Parallel ATA IDE
interfaces that can be independently enabled. The Parallel ATA 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 ICH5'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 Parallel ATA 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 105.
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 Board D865PERL supports Laser Servo (LS-120) diskette technology through the
Parallel ATA IDE interfaces. The BIOS supports booting from an LS-120 drive.
✏
NOTE
The BIOS will always recognize an LS-120 drive as an ATAPI floppy drive. To ensure correct
operation, do not configure the drive as a hard disk drive.
For information about
The location of the Parallel ATA IDE connectors
1.7.3.2 Serial ATA Interfaces
The ICH5's Serial ATA controller offers two independent Serial ATA ports with a theoretical
maximum transfer rate of 150 MB/s per port. One device can be installed on each port for a
maximum of two Serial ATA devices. A point-to-point interface is used for host to device
connections, unlike IDE which supports a master/slave configuration and two devices per channel.
For compatibility, the underlying Serial ATA functionality is transparent to the operating system.
The Serial ATA controller can operate in both legacy and native modes. In legacy mode, standard
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Refer to
Figure 22, page 68