198
EXTAL
Address
RD
HWR
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 (b) Example Idle Cycle Operation in RAS Down Mode (ICIS0=1)
7.8.2
Pin States in Idle Cycle
Table 7-8 shows pin states in an idle cycle.
Table 7-8
Pin States in Idle Cycle
Pins
Pin State
A23 to A0
Contents of next bus cycle
D15 to D0
High impedance
CSn
High
*
CAS
High
AS
High
RD
High
HWR
High
LWR
High
DACKn
High
Note:
*
Remains low in DRAM space RAS down mode or a refresh cycle.
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 ...