User's Manual

SCSI Interface Chapter 5

STT20000N Product Manual Page 33

SCSI Interface

Introduction

The STT20000 SCSI minicartridge drive provides an embedded Small Computer

System Interface (SCSI) controller for communications between the host computer

and the drive. The drive supports the SCSI-1 (ANSI X3.131, 1986) and SCSI-2

(ANSI X3.T92) interfaces. The factory default interface at power up is for the SCSI-2

interface.

The STT20000 SCSI minicartridge drive provides a single-ended SCSI connection.

This chapter summarizes the SCSI-1 and SCSI-2 status codes, message codes,

and commands. Refer to Chapter 3 for specific SCSI cabling and connector

information.

Note:

Refer to the

SCSI Minicartridge Drive SCSI Manual

(P/N

10001652-002) for detailed information about the SCSI interfaces. That

manual includes an alphabetically arranged summary of the STT20000

SCSI minicartridge drive SCSI commands.

SCSI-1 interface

The SCSI-1 interface for the drive complies with the ANSI Standard

X3.131-1986. The following tables list the Status Codes, Message Codes, and

Commands, respectively, for this interface.

SCSI-1 status codes

4-bit Status Code

Bits 4 3 2 1 0 Definition

0 0 0 0 X Good Status

0 0 0 1 X Check Condition

0 1 0 0 X Busy

1 0 0 0 X Intermediate Status

1 1 0 0 X Reservation Conflict