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Page 2 DDS-4 SCSI Interface Manual, Rev. B
SCSI Interface Description
Overview
The Seagate DDS-4 and DAT 72 drives are designed to operate with the Small
Computer System Interface (SCSI) bus. This chapter discusses SCSI bus operation
as it pertains to drive functions.
SCSI is a standard interface established to support peripheral equipment such as
printers, tape drives, magnetic disks, optical disks for microcomputers and other
computer systems. The SCSI bus can support up to eight devices consisting of any
multiple of host adapters and peripheral devices.
The Seagate DDS-4 and DAT 72 drives comply with SCSI-2 and SCSI-3
specifications. In a few cases, vendor unique features are available. These features
are compatible with the SCSI standards.
The interface is a sixteen-port daisy-chained bus using twenty-seven signal lines:
eighteen data-bit signal lines and nine control lines. The eighteen data-bit lines are
made up of two pairs of eight data signal lines and one parity bit line. The remaining
nine lines provide control and status signals to coordinate data transfer operations
between the host controller and the selected drive.
The drives have an internal SCSI controller integrated into the drive electronics.
Each device ID on the SCSI bus may drive up to 8 logical units (LUN). These drives
support only LUN 0, except for the Autoloader, which also uses LUN 1.
ANSI SCSI Bus Standards
In addition to the information presented in this manual, we recommend that for
SCSI-2, read the ANSI Working Draft Revision 10 standard before writing host
software drivers. Also, see the conformance statements, which are given in the
Product Description Manual for the each model of drive or Autoloader.
Cabling and Connectors
The cabling requirements and pin outs for the SCSI connector for the internal drive
models are given in the respective installation guide and Product Description
Manual for each model of DAT drive or Autoloader.
2
- Contents 5
- Commands 34 6
- Introduction 13
- SCSI Interface Description 14
- Signal Descriptions 15
- Command Set Description 16
- General features 17
- SCSI Bus Protocol 18
- Waiting and Control Phases 19
- Figure 2-1 20
- Figure 2-2 20
- Select With Attention 22
- Identify Message 22
- Information Transfer Phases 23
- Figure 2-4 24
- Synchronous Data Transfer 25
- Command Phase 26
- Data Phase 27
- Status Phase 27
- Message Phase 27
- Command Descriptor Block 28
- Logical Unit Support 29
- Attention Condition 36
- Reset Condition 36
- Unit Attention Condition 36
- Buffered Mode 37
- Immediate Function 37
- Residual Length Function 37
- SCSI Memory Address Pointers 39
- Early Warning Function 39
- Error Reporting 40
- Autoloader Operation 41
- General Operation 43
- Loading and Initialization 43
- Front Panel Operation 44
- Cassette Selection 44
- Automatic Loading Mode 44
- Magazine Ejection 45
- Stray Tape Recovery 45
- Commands 46
- Conventions 47
- ERASE (19h) 49
- INQUIRY (12h) 53
- Standard INQUIRY Data Format 54
- LOAD/UNLOAD (1Bh) 57
- LOCATE (2Bh) 59
- LOCATE and the BT Bit 60
- LOG SELECT (4Ch) 62
- Use of the PC Bits 63
- LOG SELECT Parameter Data 64
- LOG SENSE (4Dh) 69
- Using Page Control Bits 71
- Log Sense Pages 72
- Page Header 73
- MODE SELECT (15h) 85
- MODE SELECT Parameters 86
- Completion Status 100
- MODE SENSE (1Ah) 101
- MODE SENSE Parameters 103
- Mode Page Format 105
- READ (08h) 117
- READ BLOCK LIMITS (05h) 122
- READ DATA BUFFER (3Ch) 124
- READ DATA BUFFER Header 125
- Element Status Data 126
- Element Status Data Header 127
- READ POSITION (34h) 131
- READ POSITION Data Format 132
- RELEASE UNIT (17h / 57h) 138
- REPORT DENSITY SUPPORT (44h) 140
- REQUEST BLOCK ADDRESS (02h) 143
- REQUEST SENSE (03h) 145
- Definition of Sense Keys 147
- RESERVE UNIT (16h / 56h) 158
- REWIND (01h) 161
- SEEK BLOCK (0Ch) 162
- SEND DIAGNOSTIC (1Dh) 164
- SPACE (11h) 166
- Space-by-Count Functions 167
- Space and the RSMK Bit 168
- TEST UNIT READY (00h) 170
- VERIFY (13h) 172
- WRITE (0Ah) 174
- WRITE DATA BUFFER (3Bh) 176
- WRITE FILEMARKS (10h) 179
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