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Word Description Contents
65
Minimum multiword DMA transfer cycle time
per word (120 nsec)
0078
H
66
Recommended multiword DMA transfer
cycle time per word (180 nsec)
0078
H
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.
The following DMA mode settings are used in word 63 of the
Identify Drive command:
Word Bit Description (if bit is set to 1)
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 2250 and Marathon 1680 Product Manual 31