133
7.1.2
Block Diagram
Figure 7-1 shows a block diagram of the bus controller.
Area decoder
Bus
controller
ABWCR
ASTCR
BCRH
BCRL
Internal
address bus
External bus control signals
CS0
to
CS7
Legend:
ABWCR : Bus width control register
ASTCR
: Access state control register
BCRH
: Bus control register H
BCRL
: Bus control register L
WCRH
: Wait control register H
WCRL
: Wait control register L
MCR
DRAMCR
RTCNT
RTCOR
: Memory control register
: DRAM control register
: Refresh timer counter
: Refresh time constand register
BREQ
BACK
BREQO
Internal control
signals
Wait
controller
WCRH
WCRL
DRAM controller
External DRAM
control signal
MCR
DRAMCR
RTCNT
RTCOR
Bus mode signal
Bus arbiter
CPU bus request signal
DTC bus request signal
DMAC bus request signal
CPU bus acknowledge signal
DTC bus acknowledge signal
DMAC bus acknowledge signal
WAIT
Internal data bus
Figure 7-1 Block Diagram of Bus Controller
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 ...