Datasheet

Section 8 EXDMA Controller
Rev. 3.00 Mar 17, 2006 page 371 of 926
REJ09B0283-0300
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
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
φ
Figure 8.17 Example of Block Transfer Mode (Cycle Steal Mode) Transfer