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7.9 Ultra DMA timings
The Ultra DMA timings meet Mode 0, 1, 2, 3, 4, and 5 of the Ultra DMA Protocol.
7.9.1 Initiating Read DMA
DMARQ
DMACK-
STOP
HDMARDY-
DSTROBE
DD(15:0)
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PARAMETER DESCRIPTION
tUI
Unlimited interlock time
tACK
Setup time for DMACK-
tENV
Envelope time
tZIORDY
Minimum time before
driving IORDY
tFS
First DSTROBE time
tCYC
Cycle time
t2CYC
Two cycle time
tAZ
Maximum time allowed for
output drivers to release
tZAD
Drivers to assert
tDS
Data setup time at host
tDH
Data hold time at host
Figure 40. Ultra DMA cycle timings (Initiating Read)
tUI
tACK
tENV
tACK
tENV
tZIORDY
tAZ
Host drives DD
MODE 0
MIN
MAX
(ns)
(ns)
0
20
20
0
0
230
112
230
–
0
15
5
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
tFS
tDS
tAZD
xxx
RD Data
Device drives DD
MODE 1
MODE 2
MIN
MAX
MIN
MAX
(ns)
(ns)
(ns)
(ns)
–
0
–
0
–
–
20
–
20
–
70
20
70
20
70
–
0
–
0
–
0
200
0
170
–
73
–
54
–
–
154
–
115
–
10
–
10
–
10
–
0
–
0
–
–
10
–
7
–
–
5
–
5
–
50
t2CYC
tCYC
tCYC
tDH
xxx
xxx
RD Data
MODE 3
MODE 4
MIN
MAX
MIN
MAX
(ns)
(ns)
(ns)
(ns)
0
–
0
–
20
–
20
–
20
55
20
55
0
–
0
–
0
130
0
120
39
–
25
–
86
–
57
–
–
10
–
10
0
–
0
–
7
–
5
–
5
–
5
–
RD Data
MODE 5
MIN
MAX
(ns)
(ns)
0
–
20
–
20
50
0
–
–
90
16.8
–
38
-
10
0
–
4.8
–
4.8
–
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