IBM IC35L020 Hard Drive Specifications - Page 46

Ultra DMA timings

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

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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