93
4.1.2
Block Diagram
Area decoder
Internal address bus
EXDMAC address bus
CS7
to
CS0
WAIT
BREQ
BACK
BREQO
External bus
control signals
Internal bus control signals
Internal data bus
Control registers
Address
selector
External bus
arbiter
External bus controller
Internal bus
arbiter
Internal bus controller
Internal bus master bus request signal
EXDMAC bus request signal
Internal bus master bus acknowledge signal
EXDMAC bus acknowledge signal
CPU bus request signal
DTC bus request signal
DMAC bus request signal
CPU bus acknowledge signal
DTC bus acknowledge signal
DMAC bus acknowledge signal
ABWCR
ASTCR
WTCRAH WTCRAL
WTCRBH WTCRBL
RDNCR
DRAMCRH DRAMCRL
DRACCR
REFCRH
REFCRL
RTCNT
RTCOR
CSACRH
CSACRL
BROMCRH BROMCRL
BCRL
BCRH
Figure 4.1 Block Diagram of Bus Controller
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