Rev. 1.0, 09/01, page 350 of 904
DMA read DMA write DMA read DMA write DMA read DMA write
Address bus
Bus
release
Bus
release
Last transfer cycle
Burst transfer
ø
Figure 8.16 Example of Normal Transfer Mode (Burst Mode) Transfer
If an NMI interrupt is generated while a channel designated for burst transfer is enabled for
transfer, the EDA bit is cleared and transfer is disabled. If a block transfer has already been
initiated within the EXDMAC, the bus is released on completion of the currently executing byte or
word transfer, and burst transfer is aborted. If the last transfer cycle in burst transfer has been
initiated within the EXDMAC, transfer is executed to the end even if the EDA bit is cleared.
Block Transfer Mode (Cycle Steal Mode): Figure 8.17 shows an example of transfer when
(7(1'
output is enabled, and word-size, block transfer mode (cycle steal mode) is performed
from external 16-bit, 2-state access space to external 16-bit, 2-state access space.
One block is transferred in response to one transfer request, and after the transfer, the bus is
released. While the bus is released, one or more CPU, DMAC, or DTC bus cycles are initiated.
DMA
read
DMA
write
Address bus
Bus
release
Bus
release
Bus
release
Last block transfer
DMA
read
Block transfer
DMA
write
DMA
read
DMA
write
DMA
read
DMA
write
ø
Figure 8.17 Example of Block Transfer Mode (Cycle Steal Mode) Transfer
Содержание H8S/2376 F-ZTAT
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