IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive - 10.0 Registers

7.9.4 Device Terminating Read DMA
DSTROBE
HDMARDY-
DMACK-
DMARQ
STOP
tMLI
DD(15:0)
tZAH
xxxxxxxxxxxxxxxxxx
Device drives DD
Host drives DD
tCH
tCS
CRC
tACK
tACK
tLI
tIORDYZ
xxxxxx xxxxxxxxxx
tSS
tLI
tLI
tAZ
––20–20–20–20–20–
Maximum time before releasing
IORDY
tIORDYZ
–
–
–
20
–
20
–
20
–
20
–
20
Hold time for DMACK-
tACK
–
4.6
–
5
–
5
–
5
–
5
–
5
CRC word hold time at device
tCH
–
4
–
5
–
7
–
7
–
10
–
15
CRC word setup time at device
tCS
–
20
–
20
–
20
–
20
–
20
–
20
Interlock time with minimum
tMLI
–20–20–20–20–20–20
Maximum delay time required
for output
tZAH
10–10–10–10–10–10–
Maximum time allowed for
output drivers to release
tAZ
75
0
100
0
100
0
150
0
150
0
150
0
Limited interlock time
tLI
–50–50–50–50–50–50
Time from DSTROBE edge to
negation of DMARQ
tSS
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 46. Ultra DMA cycle timings (Device Terminating Read)
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
57