197
(4) Notes
The setting of the ICIS0 and ICIS1 bits is invalid when accessing the DRAM space. For example,
if the 2nd of successive reads of different areas is a DRAM access, only the T
P
cycle is inserted,
not the T
1
cycle. Figure 7-36 shows the timing. Note, however, that ICIS0 and ICIS1 settings are
valid in burst access in RAS down mode, and an idle cycle is inserted. Figure 7-37 (a) and (b)
shows the timing.
T
1
Address bus
ø
RD
External read
Data bus
T
2
T
3
T
p
T
r
DRAM space read
T
c1
T
c2
Figure 7-36 Example of DRAM Access after External Read
EXTAL
Address
RD
RAS
CAS, LCAS
Data bus
DRAM space read
T
p
T
r
T
c1
T
c2
T
1
T
1
T
2
T
3
T
c1
T
c1
T
c2
External read
DRAM space read
Idle cycle
Figure 7-37 (a) Example Idle Cycle Operation in RAS Down Mode (ICIS1=1)
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 ...