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81-81200-02 REV A01 January 2005 2-1

CHAPTER 2

SCSI Parallel Protocol

This chapter covers the following topics:

• “Background Information About SCSI” describes the knowledge required to use this manual

successfully.

• “Information Transfer Phases” describes the specifics of information transfer in SDLT tape drives.

• “SCSI Bus Conditions” describes the two asynchronous conditions of the SCSI bus.

2.1 Background Information About SCSI

Small Computer System Interface (SCSI) is one of the industry’s most widely adopted I/O interfaces;

it is widely used in computing platforms from personal computers to mainframes to peripheral devices

of all types. SDLT tape drives conform to the SPI-3 standard. You should familiarize yourself with the

SCSI-3, SAM-2, SPC-2, SPI-3, and SSC standards before using the remaining portions of this manual.

Important features of SPI-3 implementation include the following:

• Efficient peer-to-peer I/O bus for up to 15 devices

• Asynchronous transfer rates that depend only on device implementation and cable length

• Logical addressing (rather than physical addressing) for all data blocks

• Multiple initiators and multiple targets

• Distributed arbitration (bus contention logic)

• Command set enhancement.

NOTE: Complete SCSI standards documents are available at www.t10.org.

SDLT 600

SCSI Interface Guide

SCSI Parallel Protocol

81-81200-02

REV A01

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