IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive - Ultra DMA Timings; Initiating Read DMA; Figure 43. Ultra DMA Cycle Timing (Initiating Read)

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
DSTROBE
HDMARDY-
DMACK-
DMARQ
STOP
tUI
tACK tENV
tACK tENV
tZIORDY
tFS tCYC
t2CYC
DD(15:0)
tZAD
tAZ
xxxxxxxxxxxxxxxxxxxxxxxxxxx xxx xxxx xxx
Host drives DD
Device drives DD
tDH
tDS
RD Data RD Data
RD Data
tCYC
–
4.8
–
5
–
5
–
5
–
5
–
5
Data hold time at host
tDH
–
4.8
–
5
–
7
–
7
–
10
–
15
Data setup time at host
tDS
–
0
–
0
–
0
–
0
–
0
–
0
Drivers to assert
tZAD
1010–10–10–10–10–
Maximum time allowed for
output drivers to release
tAZ
-
38
–
57
–
86
–
115
–
154
–
230
Two cycle time
t2CYC
–
16.8
–
25
–
39
–
54
–
73
–
112
Cycle time
tCYC
90
–
120
0
130
0
170
0
200
0
230
0
First DSTROBE time
tFS
–0–0–0–0–0–0
Minimum time before
driving IORDY
tZIORDY
50
20
55
20
55
20
70
20
70
20
70
20
Envelope time
tENV
–
20
–
20
–
20
–
20
–
20
–
20
Setup time for DMACK-
tACK
–
0
–
0
–
0
–
0
–
0
–
0
Unlimited interlock time
tUI
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MODE 5
MODE 4
MODE 3
MODE 2
MODE 1
MODE 0
PARAMETER DESCRIPTION
Figure 43. Ultra DMA cycle timing (Initiating Read)
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
54