Ultra Dma Timings; Initiating Read Dma; Table 20: Ultra Dma Cycle Timings (Initiating Read) - Hitachi HDT725025VLA380 - Deskstar 0A33423 T7K500 250GB SATA 7200RPM 8MB Cache Hard Drive Specifications

6.9 Ultra DMA timings

The Ultra DMA timings meet Mode 0, 1, 2, and 4, 5 and 6 of the Ultra DMA Protocol.

6.9.1 Initiating Read DMA

DMARQ
DMACK-
STOP
HDMARDY-
DSTROBE
DD(15:0)

Table 20: Ultra DMA cycle timings (Initiating Read)

PARAMETER
DESCRIPTION
(all values in ns)
tUI Unlimited interlock time
tACK Setup time for DMACK-
tENV Envelope time
tZI- Minimum time before
ORDY 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
tDZFS Time from data ouput
released-to-driving until
the first transition of crit-
ical timing
tUI
tACK tENV
tACK tENV
tZIORDY
tAZ
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Host drives DD
MODE 0 MODE 1
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX
0 – 0 –
20 – 20 –
20 70 20 70
0 – 0 –
0 230 0 200
112 – 73 –
230 – 154 –
– 10 – 10
0 – 0 –
15 – 10 –
5 – 5 –
70 – 48 –
Deskstar T7K500 Hard Disk Drive Specification
t2CYC
tFS tCYC
tDS
tZAD
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RD Data RD Data
Device drives DD
MODE 2 MODE 3
0 0 0 –
20 – 20 –
20 70 20 55
0 – 0 –
0 170 0 130
54 – 39 –
115 – 86 –
– 10 – 10
0 – 0 –
7 – 7 –
5 – 5 –
31 – 20 –
32
tCYC
tDH
xxx
RD Data
MODE 4 MODE 5
0 – 0 –
20 – 20 –
20 55 20 50
0 – 0 –
0 120 – 90
25 – 17 –
–
57 – 38
– 10 10
0 – 0 –
5 – 4.8 –
5 – 4.8 –
6.7 – 25 –
MODE 6
0 –
20 –
20 50
0 –
0 80
13 –
29 –
10
–
0
–
2.6
–
3.5
–
17.5
–