9.1.7 Ultra DMA timings
The Ultra DMA timing meets Modes 0, 1, 2, 3, 4, and 5 of the Ultra DMA Protocol.
9.1.7.1 Initiating Read DMA
DSTROBE
HDMARDY-
DMACK-
DMARQ
STOP
tUI
tACK
tENV
tACK
tENV
tZIORDY
tFS
tCYC
tCYC
t2CYC
DD00–DD15
tZAD
tAZ
xxxxxxxxxxxxxxxxxxxxxxxxx
xxx
xxx
xxx
Host drives DD
Device drives DD
tDVH
tDVS
RD Data
RD Data
RD Data
tZAD
tDZSF
(all values are in ns)
–
25
–
7
–
20
–
31
–
48
–
70
Time from data output until
the first transition
tDZFS
–
5
–
6
–
6
–
6
–
6
–
6
Data hold time (at device side)
tDVH
–
5
–
7
–
20
–
31
–
48
–
70
Data setup time (at device side)
tDVS
–
0
–
0
–
0
–
0
–
0
–
0
Output enable time
tZAD
10
–
10
–
10
–
10
–
10
–
10
–
Output release time
tAZ
–
38
–
57
–
86
–
115
–
153
–
230
2 cycle time
t2CYC
–
17
–
25
–
39
–
54
–
73
–
112
Cycle time
tCYC
90
0
120
0
130
0
170
0
200
0
230
0
First strobe time
tFS
–
0
–
0
–
0
–
0
–
0
–
0
Wait time before driving
DSTROBE
tZIORDY
50
20
55
20
55
20
70
20
70
20
70
20
Envelope time
tENV
–
20
–
20
–
20
–
20
–
20
–
20
Setup time before -DMACK
tACK
–
0
–
0
–
0
–
0
–
0
–
0
Unlimited interlock time
tUI
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
Parameter descriptions
MODE5
MODE4
MODE3
MODE2
MODE1
MODE0
Signal
names
Figure 27. Ultra DMA cycle timings—Initiating Read
Deskstar 60 GXP Hard disk drive specification
32
Содержание IC35L020 - Deskstar 20 GB Hard Drive
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