Datasheet

Travelstar 80GN Hard Disk Drive Specification
47
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
Table 28: Ultra DMA cycle timings (Initiating Read)
PARAMETER
DESCRIPTION
MODE 0MODE 1MODE 2MODE 3MODE 4MODE 5
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
MIN
(ns)
MAX
(ns)
tUI Unlimited interlock time0–0–0–0–0–0–
tACKSetup time for DMACK-20–20–20–20–20–20–
tENV Envelope time 20 70 20 70 20 70 20 55 20 55 20 50
tZIORDY Minimum time before driv-
ing IORDY
0–0–0–0–0–0–
tFS First DSTROBE time 023002000170013001200 90
tCYC Cycle time 112 – 73 – 54 – 39 – 25 – 16.8 –
t2CYC Two cycle time 230 – 154 – 115 – 86 – 57 – 38 –
tAZ
Maximum time allowed for
output drivers to release
–10–10–10–10–10–10
tZAD
Drivers to assert 0–0–0–0–0–0–
tDS
Data setup time at host15–10–7–7–5–4–
tDH
Data hold time at host 5–5–5–5–5–4.6–
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