Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
35
6.8 Ultra DMA timings
The Ultra DMA timings meet Mode 0, 1, 2, and 4 of the Ultra DMA Protocol.
6.8.1 Initiating Read DMA
Table 25: Ultra DMA cycle timing chart (Initiating Read)
Table 26: Ultra DMA cycle timings (Initiating Read)
PARAMETER
DESCRIPTION
(all values in ns)
MODE 0MODE 1MODE 2MODE 3MODE 4MODE 5MODE 6
MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX
tUI Unlimited interlock time 0–0–000–0–0–0--
tACK Setup time for DMACK- 20 – 20 – 20 – 20 – 20 – 20 – 20 --
tENV Envelope time 20 70 20 70 20 70 20 55 20 55 20 50 20 50
tZIORDY
Minimum time before driving
IORDY
0–0–0–0–0–0–0--
tFS First DSTROBE time 0 230 0 200 0 170 0 130 0 120 – 90 0 80
tCYC Cycle time 112–73–54–39–25–17–13--
t2CYC Two cycle time 230 – 154 – 115 – 86 – 57 – 38 – 29 --
tAZ
Maximum time allowed for out-
put drivers to release
–10–10–10–10–10 10--10
tZADDrivers to assert 0–0–0–0–0–0–0--
tDS Data setup time at host 15–10–7–7–5–4.8–2.6--
tDH Data hold time at host 5–5–5–5–5–4.8–3.5--
tDZFS
Time from data output
released-to-driving until the first
transition of critical timing
70 – 48 – 31 – 20 – 6.7 – 25 – 17.5 --
DSTROBE
HDMARDY-
DMACK-
DMARQ
STOP
tUI
tACK tENV
tACK tENV
tZIORDY
tFS tCYC
t2CYC
DD(15:0)
tZAD
tAZ
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Host drives DD
Device drives DD
tDH
tDS
RD Data RD Data
RD Data
tCYC
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