I/O Kit Fundamentals: SCSI Parallel

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SCSI Parallel

The SCSI Parallel family provides support for, and access to, devices attached to a parallel SCSI bus. This family supports all major features of the SCSI Parallel Interface-5 (SPI-5) specification for parallel buses.

Bundle identifier:

com.apple.iokit.IOSCSIParallelFamily

Headers in:

Kernel resident: Kernel.framework/Headers/IOKit/scsi/spi. The header file IOSCSIParallelInterfaceController.h supports the development of a driver for a SCSI card.

References and specifications:

T10 Technical Committee —http://www.t10.org
SCSI Technical Library of Information—http://www.scsilibrary.com/

Class hierarchy:

Device interface:

Device interface support for parallel SCSI devices is provided by the SCSI Architecture Model family. See “SCSI Architecture Model”

**Table A-10** Clients and providers of the SCSI Parallel family
	Client of the nub	Provider for the nub
Action	Drives a device that plugs into a SCSI bus.	Drives a SCSI host adapter or controller chip.
Example	A driver for a SCSI disk drive is a client of the SCSI Parallel family but a member of the Storage family.
Classes	A client driver communicates with the SCSI Parallel family through an instance of IOSCSIDevice. Your driver would match on this instance and be loaded into the kernel. Another class of interest is IOSCSICommand.	Because the SCSI Parallel family presently supports parallel buses, member drivers use the IOSCSIParallelInterfaceController class.
Notes	Common client families include the Transport Drivers for storage devices.	Mac OS X includes generic drivers for most built-in SCSI hardware. In general, third-party developers do not need to write drivers that are members of the SCSI Parallel family unless they are developing drivers for an expansion card.

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Last updated: 2007-05-17

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