Atapi Packet Command (A0H); Atapi Soft Reset (08H) - Seagate STT20000A Product Manual

ATAPI Interface

ATAPI Packet Command (A0h)

ATAPI Soft Reset (08h)

STT20000A Product Manual
Word Description
53 Field Validity
54-56 Current Cylinder/Heads/Sectors
57-58 Current Capacity
59 Reserved
60-61 User Addressable Sectors
62 Single Word DMA Mode
63 Multi Word DMA Mode
64 Enhanced PIO Mode
65 Minimum Multi Word DMA Cycle Time
66 Recommended Multi Word DMA Cycle
Time
67 Minimum PIO Cycle Time w/o IORDY
68 Minimum PIO Cycle Time with IORDY
69-255 Reserved/Vendor Unique
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.
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.
Value Meaning
0002h Fields 54-58 not valid. Fields 64-70
valid
0000h Unsupported
0000h Unsupported
0000h —
0000h Unsupported
0407h Selected DMA mode 2 (Upper Byte),
DMA modes 2,1,0 Supported.
0407h Selected DMA mode 2 (Upper Byte)
DMA modes 2, 1, 0 supported.
0003h PIO Mode 3 and 4 Supported
0078h Mode 2 (120 nanoseconds)
0078h Mode 2 (120 nanoseconds)
0078h Mode 4 (120 nanoseconds)
0078h Mode 4 (120 nanoseconds)
0000h —
Chapter 5
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