190
7.6.2
DDS=0
When the DRAM space is accessed in DMAC single address mode, always perform full access
(normal access). The
DACK
output level changes to Low afer the T
r
state in the case of the
DRAM interface.
In other than DMAC signle address mode, burst access is possible when the DRAM space is
accessed.
Figure 7-31 shows the
DACK
output timing for the DRAM interface when DDS=0.
T
p
ø
Read
Write
Note: n = 2 to 5
D15 to D0
D15 to D0
A23 to A0
T
r
T
c1
T
c2
row
column
CSn
(
RAS
)
CAS
(
UCAS
)
LCAS
(
LCAS
)
CAS
(
UCAS
)
LCAS
(
LCAS
)
DACK
HWR
(
WE
)
HWR
(
WE
)
RCTS= 1
RCTS= 0
Figure 7-31
DACK
Output Timing when DDS=0 (Example Showing DRAM Access)
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...