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Word Description ST9816AG
67
Minimum PIO cycle time without IORDY flow
control (363 nsec)
016B
H
68
Minimum PIO cycle time with IORDY flow
control (120 nsec)
0078
H
69–127 ATA reserved 0000
H
128–159 Seagate reserved
xxxx
H
160–255 ATA reserved 0000
H
Note. DMA mode settings in the Identify Drive command are reflected
in the bit settings for words 62 and 63, as shown below.
Word Bit Description (if bit is set to 1)
62 0 Single-word DMA mode 0 available
62 1 Single-word DMA mode 1 available
62 2 Single-word DMA mode 2 available
62 8 Single-word DMA mode 0 currently active
62 9 Single-word DMA mode 1 currently active
62 10 Single-word DMA mode 2 currently active
63 0 Multiword DMA mode 0 available
63 1 Multiword DMA mode 1 available
63 2 Multiword DMA mode 2 available
63 8 Multiword DMA mode 0 currently active
63 9 Multiword DMA mode 1 currently active
63 10 Multiword DMA mode 2 currently active
Marathon 810 (ST9816AG) Product Manual, August 1995 27