Seagate MARATHON 1680 Product Manual page 39

Marathon 2250 and Marathon 1680 Product Manual
Word
Minimum multiword DMA transfer cycle time
65
per word (120 nsec)
Recommended multiword DMA transfer
66
cycle time per word (180 nsec)
Minimum PIO cycle time without IORDY flow
67
control (363 nsec)
Minimum PIO cycle time with IORDY flow
68
control (120 nsec)
69–127 ATA-reserved
128–159 Seagate-reserved
160–255 ATA-reserved
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
Description
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Contents
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