IBM IC25N020ATDA04 Hard Drive Specifications - Page 69
Host Pausing Read DMA, DSTROBE, HDMARDY, DMACK, DMARQ - to 60 times
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7.9.2 Host Pausing Read DMA DMARQ DMACKSTOP HDMARDYDSTROBE tSR tRFS MODE 0 MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 PARAMETER DESCRIPTION MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) (ns) tSR tRFS DSTROBE to HDMARDYtime HDMARDY- to final DSTROBE time - 50 - 30 - 20 75 - 70 - 60 - 60 - 60 - 50 Note: When a host does not satisfy the tSR timing, the host should be ready to receive two more data words after HDMARDY- is negated. Figure 44. Ultra DMA cycle timings (Host Pausing Read) Travelstar 48GH, 30GN & 15GN hard disk drive specifications 55
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7.9.2
Host Pausing Read DMA
DSTROBE
HDMARDY-
DMACK-
DMARQ
tSR
STOP
tRFS
50
–
60
–
60
–
60
–
70
–
75
–
HDMARDY- to final
DSTROBE time
tRFS
–
–
–
–
–
–
20
–
30
–
50
–
DSTROBE to HDMARDY-
time
tSR
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MODE 5
MODE 4
MODE 3
MODE 2
MODE 1
MODE 0
PARAMETER DESCRIPTION
Note: When a host does not satisfy the tSR timing, the host should be ready to receive two more data
words after HDMARDY- is negated.
Figure 44. Ultra DMA cycle timings (Host Pausing Read)
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
55