Section 6 Bus Controller (BSC)
Rev. 3.00 Mar. 14, 2006 Page 125 of 804
REJ09B0104-0300
Section 6 Bus Controller (BSC)
This LSI has an on-chip bus controller (BSC) that has a bus arbitration function and controls the
operation of the internal bus masters; CPU and DMAC.
6.1 Features
•
Write data buffer function
Write access to an on-chip peripheral module and access to the on-chip memory can be
performed in parallel.
•
Bus arbitration function
Includes a bus arbiter that arbitrates bus mastership between the CPU and DMAC.
Bus mastership can be shared between the CPU and DMAC when a conflict occurs.
•
Multi-clock function
On-chip peripheral functions can be synchronized with the on-chip peripheral module clock
(P
φ
).
A block diagram of the bus controller is shown in figure 6.1.
Internal bus
control unit
Internal data bus
[Legend]
Internal bus
control signals
Internal
bus
arbiter
CPU bus mastership acknowledge signal
DMAC bus mastership acknowledge signal
CPU bus mastership request signal
DMAC bus mastership request signal
Control register
BCR2
BCR2:
Bus control register 2
Figure 6.1 Block Diagram of Bus Controller
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Содержание H8SX series
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