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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
96
6.7.4 Ultra DMA data transfer
Figures 6-4 through 6-13 define the timings associated with all phases of Ultra DMA bursts.
Table 6-19 contains the values for the timings for each of the Ultra DMA modes.
6.7.4.1
Initiating an Ultra DMA data in burst
The values for the timings for each of the Ultra DMA modes are contained in 6.7.4.2.
DMARQ
(device)
DMACK-
(host)
STOP
(host)
HDMARDY-
(host)
DSTROBE
(device)
DD(15:0)
t
ZAD
DA0, DA1, DA2,
CS0-, CS1-
t
UI
t
ZAD
t
ACK
t
ACK
t
ENV
t
ENV
t
ZIORDY
t
FS
t
FS
t
DVS
t
AZ
t
DVH
t
ACK
NOTE
−
The definitions for the STOP, HDMARDY and DSTROBE signal lines are not in
effect until DMARQ and DMACK are asserted.
Figure 6-4 Initiating an Ultra DMA data in burst