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Page 120 DDS-4 SCSI Interface Manual, Rev. B
READ POSITION Data Format
The following table shows the layout for the READ POSITION data format when the
Long and TCLP bits are set to 0.
Byte
Bits
7 6 5 4 3 2 1 0
0 BOP EOP 1 1 0 BPU 0 0
1 Partition Number
2 0 0 0 0 0 0 0 0
3 0 0 0 0 0 0 0 0
4 MSB—First Block Location
5 First Block Location
6 First Block Location
7 First Block Location—LSB
8 MSB—Last Block Location
9 Last Block Location
10 Last Block
11 Last Block Location—LSB
12 0 0 0 0 0 0 0 0
13 0 0 0 0 0 0 0 0
14 0 0 0 0 0 0 0 0
15 0 0 0 0 0 0 0 0
16 0 0 0 0 0 0 0 0
17 0 0 0 0 0 0 0 0
18 0 0 0 0 0 0 0 0
19 0 0 0 0 0 0 0 0
READ POSITION Data Format Field Descriptions
The following table lists the field descriptions.
Field
Name
Bytes
Bits
Description
BOP bit 0 7 If the Beginning-of-Partition bit is 1, the current logical position is at the
Beginning-of-Partition in the current partition. If this bit is 0, the current
logical position is not at the Beginning-of-Partition.
EOP bit 0 6 If the End-of-Partition bit is 1, the current logical position is between
Early-Warning and End-of-Partition in the current partition. If this bit is 0,
the current logical position is not between Early-Warning and the End-
of-Partition.
BPU 0 2 If the Block Position Unknown bit is one, the first and last block
locations are not known or cannot be obtained. If this bit is 0, the first
and last block location fields contain valid position information.
Partition
Number
1 This field reports the partition number for the current logical position.
Because the maximum number of partitions supported is two, valid
values for this bit are zero (00h) and one (01h). Partition 1 is the first
partition on a dual-partition tape.
First
Block
Location
4-7 These fields indicate the block address associated with the current
logical position. The value indicates the block address of the next data
block to be transferred between the Initiator and the drive if a READ or
WRITE command is issued.
- 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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