Fujitsu MHW2040AC Manual Do Utilizador
5.6 Timing
5.6.3 Ultra DMA data transfer
Figures 5.11 through 5.20 define the timings associated with all phases of Ultra
DMA bursts.
DMA bursts.
Table 5.23 contains the values for the timings for each of the Ultra DMA Modes.
5.6.3.1 Initiating an Ultra DMA data in burst
5.6.3.2 contains the values for the timings for each of the Ultra DMA Modes.
DMARQ
(device)
DMACK-
(host)
STOP
(host)
HDMARDY-
(host)
DSTROBE
(device)
DD (15:0)
DA0,DA1,DA2,
CS0-,CS1-
t
UI
t
ENV
t
FS
t
ENV
t
ZAD
t
FS
t
ZAD
t
DVH
t
AZ
t
ZIORDY
t
ACK
t
ACK
t
ACK
t
VDS
t
DZFS
t
ZFS
Note:
The definitions for the STOP, HDMARDY-and DSTROBE signal lines are
not in effect until DMARQ and DMACK- are asserted.
not in effect until DMARQ and DMACK- are asserted.
Figure 5.11 Initiating an Ultra DMA data in burst
C141-E258
5-151