Initiating Write Dma; Figure 47. Ultra Dma Cycle Timings (Initiating Write) - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications
2.5 inch ata/ide hard disk drive
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7.9.5
Initiating Write DMA
DMARQ
DMACK-
STOP
DDMARDY-
HSTROBE
DD(15:0)
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
PARAMETER DESCRIPTION
tUI
Unlimited interlock time
tACK
Setup time for DMACK-
tENV
Envelope time
Minimum time before driving
tZIORDY
IORDY
tLI
Limited interlock time
tCYC
Cycle time
t2CYC
Two cycle time
tDS
Data setup time at device
tDH
Data Hold time at device
Figure 47. Ultra DMA cycle timings (Initiating Write)
tUI
tENV
tACK
tZIORDY
tACK
MODE 0
MIN
(ns)
20
20
112
230
15
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
tLI
tUI
WT Data
Host drives DD
MODE 1
MODE 2
MAX
MIN
MAX
MIN
(ns)
(ns)
(ns)
(ns)
0
–
0
–
0
–
20
–
20
70
20
70
20
0
–
0
–
0
0
150
0
150
0
–
73
–
54
–
154
–
115
–
10
–
7
5
–
5
–
5
58
t2CYC
tCYC
tCYC
tDH
tDS
WT Data
xxx
xxx
WT Data
MODE 3
MODE 4
MAX
MIN
MAX
MIN
MAX
(ns)
(ns)
(ns)
(ns)
(ns)
–
0
–
0
–
20
–
20
70
20
55
20
55
–
0
–
0
150
0
100
0
100
–
39
–
25
–
86
–
57
–
7
–
5
–
5
–
5
MODE 5
MIN
MAX
(ns)
(ns)
–
0
–
–
20
–
20
55
–
0
–
0
75
–
16.8
–
–
38
–
–
4
–
–
4.6
–
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