IBM DTCA-24090 Hard Drive Specifications - Page 53
Host Pausing Read DMA
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6.5.3.2 Host Pausing Read DMA DMARQ DMACK STOP HDMARDY DSTROBE < Tsr > < Trfs > [nsec] PARAMETER DESCRIPTION MODE0 MODE1 MODE2 MIN MAX MIN MAX MIN MAX Tsr Strobe to ready response time Trfs Ready to final strobe time 50 30 20 75 60 50 Note : When a host does not meet Tsr, it should be ready to receive 2 more strobes after HDMARDY is negated. Figure 28. Ultra D M A cycle timings (Host pausing Read) Electrical Interface Specifications 45
6.5.3.2
Host Pausing Read DMA
DMARQ
DMACK
STOP
< Tsr >
HDMARDY
<
Trfs
>
DSTROBE
[nsec]
MODE0
MODE1
MODE2
PARAMETER DESCRIPTION
MIN
MAX
MIN
MAX
MIN
MAX
Tsr
Strobe to ready response time
50
30
20
Trfs
Ready to final strobe time
75
60
50
Note : When a host does not meet Tsr, it should be ready to receive 2
more strobes after
HDMARDY is negated.
Figure 28. Ultra DMA cycle timings (Host pausing Read)
Electrical Interface Specifications
45