Initiating Write Dma; Table 26.Ultra Dma Cycle Timing Chart (Initiating Write); Table 27.Ultra Dma Cycle Timings (Initiating Write) - Hitachi T7K250 - Deskstar - Hard Drive Specifications

6.10.5 Initiating Write DMA

Table 26: Ultra DMA cycle timing chart (Initiating Write)
DMARQ
DMACK-
STOP
DDMARDY-
HSTROBE
DD(15:0)
Table 27: Ultra DMA cycle timings (Initiating Write)
PARAMETER DESCRIPTION
(all values in ns)
tUI Unlimited interlock time
tACK Setup time for DMACK-
tENV Envelope time
tZIORDY Minimum time before driving
IORDY
tLI Limited interlock time
tCYC Cycle time
t2CYC Two cycle time
tDS Data setup time at device
tDH Data Hold time at device
tUI
tENV
tACK
tZIORDY
tACK
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MODE 0
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX
0
20
20
0
0
112
230
15
5
Deskstar T7K250 Hard Disk Drive Specification
tLI
tUI
WT Data
Host drives DD
MODE 1 MODE 2
– 0 – 0
– 20 – 20
70 20 70 20
– 0 – 0
150 0 150 0
– 73 – 54
– 154 – 115
– 10 – 7
– 5 – 5
39
t2CYC
tCYC tCYC
tDH
tDS
WT Data
xxx xxx WT Data
MODE 3 MODE 4
– 0 – 0
– 20 – 20
70 20 55 20
– 0 – 0
150 0 100 0
– 39 – 25
– 86 – 57
– 7 – 5
– 5 – 5
MODE 5
– 0 –
– 20 –
55 20 55
– 0 –
100 0 75
– 16.8 –
– 38 –
– 4 –
– 4.6 –