Datasheet

Section 8 EXDMA Controller (EXDMAC)
Rev.7.00 Mar. 18, 2009 page 395 of 1136
REJ09B0109-0700
Block Transfer Mode (Cycle Steal Mode): Figure 8.17 shows an example of transfer when
ETEND 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
RD
HWR
ETEND
LWR
DMA
write
A
ddress bus
φ
Bus
release
Bus
release
Bus
release
Last block transfer
DMA
read
Block transfer
DMA
write
DMA
read
DMA
write
DMA
read
DMA
write
Figure 8.17 Example of Block Transfer Mode (Cycle Steal Mode) Transfer