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4.10.3
Bus Transfer Timing
Even if a bus request is received from a bus master with a higher priority than that of the bus
master that has acquired the bus and is currently operating, the bus is not necessarily transferred
immediately. There are specific times at which each bus master can relinquish the bus.
CPU: The CPU is the lowest-priority bus master, and if a bus request is received from the DTC,
DMAC, or EXDMAC, the bus arbiter transfers the bus to the bus master that issued the request.
The timing for transfer of the bus is as follows:
•
The bus is transferred at a break between bus cycles. However, if a bus cycle is executed in
discrete operations, as in the case of a longword-size access, the bus is not transferred between
the component operations.
•
With bit manipulation instructions such as BSET and BCLR, the sequence of operations is:
data read (read), relevant bit manipulation operation (modify), write-back (write). The bus is
not transferred during this read-modify-write cycle, which is executed as a series of bus cycles.
•
If the CPU is in sleep mode, the bus is transferred immediately.
DTC: The DTC sends the bus arbiter a request for the bus when an activation request is generated.
The DTC can release the bus after a vector read, a register information read (3 states), a single data
transfer, or a register information write (3 states). It does not release the bus during a register
information read (3 states), a single data transfer, or a register information write (3 states).
DMAC: The DMAC sends the bus arbiter a request for the bus when an activation request is
generated.
In the case of an external request in short address mode or normal mode, and in cycle steal mode,
the DMAC releases the bus after a single transfer.
In block transfer mode, it releases the bus after transfer of one block, and in burst mode, after
completion of the transfer. However, in the event of an EXDMAC or external bus release request,
which have a higher priority than the DMAC, the bus may be transferred to the bus master even if
burst transfer is in progress.
EXDMAC: The EXDMAC sends the bus arbiter a request for the bus when an activation request
is generated.
As the EXDMAC is used exclusively for transfers to and from the external bus, if the bus is
transferred to the EXDMAC, internal accesses by other internal bus masters are still executed in
parallel.
In normal transfer mode or cycle steal transfer mode, the EXDMAC releases the bus after a single
transfer.
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