IBM DTLA-305040 Hard Drive Specifications - Page 45
Host Pausing Read DMA, DSTROBE, HDMARDY, DMACK, DMARQ
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7.2.4.2 Host Pausing Read DMA DMARQ DMACKSTOP HDMARDYDSTROBE tSR tRFS Figure 28. Ultra DMA cycle timing chart (Host pausing Read) tSR tRFS PARAMETER DESCRIPTION (all values in ns) Strobe to ready response time Ready to final strobe time MODE0 MODE1 MODE2 MODE3 MODE4 MODE5 MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX - 50 - 30 - 20 75 - 70 - 60 - 60 - 60 - 50 Note: When a host does not meet tSR, it should be ready to receive 2 (mode 0, 1 and 2) or 3 (mode 3, 4, and 5) more strobes after HDMARDY- is negated. Figure 29. Ultra DMA cycle timings (Host pausing Read) Deskstar 40GV & 75GXP hard disk drive specifications 33
7.2.4.2
Host Pausing Read DMA
DSTROBE
HDMARDY-
DMACK-
DMARQ
tSR
STOP
tRFS
Figure 28. Ultra DMA cycle timing chart (Host pausing Read)
50
–
60
–
60
–
60
–
70
–
75
–
Ready to final strobe time
tRFS
–
–
–
–
–
–
20
–
30
–
50
–
Strobe to ready response time
tSR
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MODE5
MODE4
MODE3
MODE2
MODE1
MODE0
PARAMETER DESCRIPTION
(all values in ns)
Note:
When a host does not meet tSR, it should be ready to receive 2 (mode 0, 1 and 2) or 3 (mode 3, 4,
and 5) more strobes after HDMARDY– is negated.
Figure 29. Ultra DMA cycle timings (Host pausing Read)
Deskstar 40GV & 75GXP hard disk drive specifications
33