Ide Support - Intel D845GEBV2 - OCTOBRE 2002 Manual

Intel Desktop Board D845GEBV2/D845GERG2 Technical Product 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 104.
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 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 on the D845GERG2 board
The location of the IDE connectors on the D845GEBV2 board
1.8.3.2 SCSI LED Connector
The SCSI LED connector is a 1 x 2-pin connector that allows an add-in SCSI controller (or other
add-in card hard drive 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 LED connector on the D845GERG2 board
The location of the SCSI LED connector on the D845GEBV2 board
The signal names of the SCSI LED connector
34
Refer to
Figure 15, page 67
Figure 16, page 68
Refer to
Figure 15, page 67
Figure 16, page 68
Table 34, page 68