Quantum DAT 24 Drive Guía de usuario Pagina 72
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Page 60 DDS-4 SCSI Interface Manual, Rev. B
command. The default threshold values are loaded into the threshold values when a
reset occurs or by a LOG SELECT command with the PCR bit set.
Default Accumulated Values
The type 3 page control bit setting specifies default accumulated values. The default
accumulated values are all zero and cannot be changed by the LOG SELECT
command. The default accumulated values are loaded into the accumulated values
when a reset occurs or when a LOG SELECT command is received with the PCR bit
set.
Using the Parameter Pointer Field
The Parameter Pointer field specifies the starting parameter code of the page that is
to be transferred.
If the Parameter Pointer field specifies a parameter code larger than the maximum
parameter code for that page, a Check Condition is generated. The sense data is
set to Illegal Request, Invalid Field in the CDB.
For example, if the page uses parameter codes 2 through 6 and the parameter
pointer field is set to 3, then the drive returns parameters 3 through 6. Likewise, if
the parameter pointer is set to 1, parameters 2 through 6 are returned.
If the Parameter Pointer field is set to 0, all parameters for that particular page are
returned up to the maximum number of bytes specified in the allocation length.
Regardless of the starting parameter code specified in the Parameter Pointer field,
the page header is always returned.
Log Sense Pages
Only one log page is transferred to the host with a single LOG SENSE CDB. Byte 2
of the CDB specifies the page to be transferred. Each log page begins with a four-
byte header, as shown in the following table.
Byte
Bits
7 6 5 4 3 2 1 0
0 0 0 | Page Code
1 0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0 0
3 Page Length (n)
The Page Code field indicates the page being returned. This data matches the page
code requested in byte 2 of the LOG SENSE CDB.
The Page Length field indicates the length of the page in bytes that follow the page
header. If the allocation length specified in the CDB is too small to transfer all of the
requested page, this value is not adjusted to reflect the truncation.
However, if the Parameter Pointer field of the CDB specifies a starting parameter
code other than zero, the page length is adjusted to indicate the number of bytes
that follow the page header.
- 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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