Intel MB440LX manual Scsi Controllers, IDE Controller

SCSI Controllers

The system board includes two wide/fast-20 SCSI controller chips integrated as PCI bus masters. These controllers support:

∙An 8-bit (narrow SCSI) data path at a data transfer rate of 20 MB/sec.

∙A 16-bit (wide SCSI) data path at a data transfer rate of 40 MB/sec.

∙Data transfer rates of 133 MB/sec as PCI bus masters.

∙The connection of a maximum of seven 8-bit narrow SCSI devices to each controller.

∙The connection of a mixture of up to fifteen 16-bit wide and/or 8-bit narrow SCSI devices to each controller (maximum of seven 8-bit narrow devices).

The system board also includes a narrow SCSI controller integrated as a PCI bus master. You can connect a maximum of seven narrow SCSI devices to this controller.

The SCSI controllers provide active negation outputs, controls for external differential transceivers, and a disk activity output. Active negation outputs reduce the chance of data errors by actively driving both polarities of the SCSI bus and avoiding indeterminate voltage levels and common-mode noise on long cable runs. The SCSI output drivers can directly drive a

48 milliampere (mA), single-ended SCSI bus with no additional drivers.

IDE Controller

The PIIX4 multifunction device on the system board acts as a PCI-based Fast IDE controller that supports

∙PIO and IDE DMA/bus master operations

∙Mode 4 timings

∙Transfer rates up to 32 MB/sec

∙Buffering for PCI/IDE burst transfers

∙Master/slave IDE mode

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