Seagate Technology 10002475-003, Руководство по описанию продукции

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Chapter 5 ATAPI Interface
Page 38 STT8000 ATAPI Minicartridge Drive
The following table defines the values returned by the drive.
Word Description Value Meaning
0 General Configuration 81C0h ATAPI Streaming Tape, Removable
Accelerated DRQ, 12 byte packets
1-3 Disk info: dylinders, eads 0000h Unsupported
4-6 Disk info: track, sector sizes 0000h Unsupported
7-9 Reserved 0000h —
10-19 Serial Number (20 ASCII characters) "N...N" Serial Number
20 Buffer Type 4002h Cap&Mech Sts bytes 6 and 7
21 Buffer Size 02D8h 14 frames of 52 data blocks=728
22 ECC Bytes Available 0000h Unsupported
23-26 Firmware Revision (8 ASCII characters) "N.NN" Firmware Revision
27-46 Model Number (40 ASCII characters) Model Number. "CONNER CTT 8000-A"
47,48 Disk info: mult-xfer, double word I/O 0000h Unsupported
49 Capabilities 0F00h IORDY supported. Logical Blocks
Addressing and DMA supported
50 Reserved 0000h —
51 PIO Data Transfer Cycle Timing 0200h Mode 2
52 DMA Data Transfer Cycle Timing 0200h Mode 2
53 Field Validity 0002h Fields 54-58 not valid. Fields 64-70 valid
54-56 Current Cylinder/Heads/Sectors 0000h Unsupported
57-58 Current Capacity 0000h Unsupported
59 Reserved 0000h —
60-61 User Addressable Sectors 0000h Unsupported
62 Single Word DMA Mode 0407h Selected DMA mode 2 (Upper Byte),
DMA modes 2,1,0 Supported.
63 Multi Word DMA Mode 0407h Selected DMA mode 2 (Upper Byte)
DMA modes 2, 1, 0 supported.
64 Enhanced PIO Mode 0003h PIO Mode 3 and 4 Supported
65 Minimum Multi Word DMA Cycle Time 0078h Mode 2 (120 nanoseconds)
66 Recommended Multi Word DMA Cycle
Time 0078h Mode 2 (120 nanoseconds)
67 Minimum PIO Cycle Time w/o IORDY 0078h Mode 4 (120 nanoseconds)
68 Minimum PIO Cycle Time with IORDY 0078h Mode 4 (120 nanoseconds)
69-255 Reserved/Vendor Unique 0000h —
ATAPI Packet Command (A0h)
Before issuing the ATAPI Packet command, the host writes to the Byte Count
register (high and low) the maximum/preferred number of bytes to be
transferred in a single PIO DRQ. For Data Transfer commands (READ and
WRITE), this value is assumed to be greater than or equal to 512 and is
ignored.
ATAPI Soft Reset (08h)
The ATAPI Soft Reset command performs a complete microprocessor reset.
Current physical and logical position is lost, and if a tape is present, a LOAD
sequence is performed, resulting in a Ready at BOP0 condition (with Unit Attn).
The DSC is set to 1 before the BSY bit is cleared.