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Page 82 DDS-4 SCSI Interface Manual, Rev. B
Device Configuration Page Field Descriptions
The following table describes the fields in the Device Configuration page.
Field
Name
Bytes
Bits
Description
Page Code 0 0-5 The Page Code field must be set to 10h to select this page.
Page
Length
1 The Page Length field must be set to 14 (0Eh), which indicates that
14 parameter bytes follow the Page Length byte.
CAP bit 2 6 The CAP (Change Active Partition) bit is used to effect a partition
change. When the CAP bit is 1, the drive switches to the partition
specified in the Active Partition field. Once the MODE SELECT
command completes, the logical position is the BOP of the new
partition.
If the CAP bit is 0, no partition change results
CAF bit 2 5 The CAF (Change Active Format) bit is used to modify the tape
format. When the CAF bit is 1, bits 4-0 of byte may be changed.
DIS RAW 2 4 The DIS RAW (Disable Read-After-Write) bit enables and disables
the read-after-write capability. If the value is 1, read-after-write check
and rewrites are disabled. If the value is 0, read-after-write is enabled.
EN C3 2 3 The EN C3 (Enable C3) bit enables and disables C3 ECC code
generation during writing. If the value is 1, C3 ECC code is generated
during writing; if the value is 0, C3 ECC code is not generated.
N-Group 2 0-3 The N-Group field specifies the number of copies of each tape group
to record. Values greater than 0 can be used to increase reliability.
Active
Partition
3 The Active Partition field is valid only when the CAP bit is 1. This field
specifies the partition number of the new partition to which the drive
switches when the MODE SELECT command completes.
The drive supports a maximum of two partitions. The valid values for
this field are 0 (00h) and 1 (01h). Partition 1 is the first partition on a
dual-partition tape.
Write
Delay time
6-7 For a WRITE command, the Write Delay Time field indicates to the
drive how long in 100 millisecond increments, to delay writing
buffered data to tape after the last WRITE command.
BIS bit 8 6 Not supported, must be set to 1
RSMK bit 8 5 The Report Setmarks (RSMK) bit determines whether or not the drive
recognizes setmarks.
If the value is 1, the drive recognizes and reports setmarks during
appropriate read and space operations.
If the value is 0, the drive ignores setmarks. It skips any setmark it
finds during execution of read- or space-type commands.
- 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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