6.8.5 Initiating Write DMA
Table 32: Ultra DMA cycle timing chart (Initiating Write)
DMARQ
DMACK-
STOP
DDMARDY-
HSTROBE
DD(15:0)
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
MODE 1
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX
0
–
0
20
–
20
20
70
20
0
–
0
0
150
0
112
–
73
230
–
154
15
–
10
5
–
5
Deskstar 7K80 Hard Disk Drive Specification
tLI
tUI
WT Data
Host drives DD
MODE 2
MODE 3
–
0
–
0
–
20
–
20
70
20
70
20
–
0
–
0
150
0
150
0
100
–
54
–
39
–
115
–
86
–
7
–
7
–
5
–
5
46
t2CYC
tCYC
tCYC
tDH
tDS
WT Data
xxx
xxx
WT Data
MODE 4
MODE 5
–
0
–
0
–
20
–
20
55
20
55
20
–
0
–
0
0
100
0
–
25
–
16.8
–
57
–
38
–
5
–
4
–
5
–
4.6
MODE 6
–
0
–
–
20
–
55
20
50
–
0
–
75
0
60
–
13.0
–
–
29
–
–
2.6
–
–
3.5
–