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DMAC
This LSI
DACK
DREQ
External address bus
External data bus
External
memory
External device
with DACK
Data flow
Figure 8.7 Data Flow in Single Address Mode
Two kinds of transfer are possible in single address mode: (1) transfer between an external
device with DACK and a memory-mapped external device, and (2) transfer between an
external device with DACK and external memory. In both cases, only the external request
signal (DREQ) is used for transfer requests.
Figures 8.8 shows example of DMA transfer timing in single address mode.
Address output to external memory space
Select signal to external memory space
Select signal to external memory space
Data output from external device with DACK
DACK signal (active-low) to external device with DACK
Write strobe signal to external memory space
Address output to external memory space
Data output from external memory space
DACK signal (active-low) to external device with DACK
Read strobe signal to external memory space
(a) External device with DACK
→
external memory space (ordinary memory)
(b) External memory space (ordinary memory)
→
external device with DACK
CKIO
A25 to A0
D31 to D0
DACKn
CSn
WE
CKIO
A25 to A0
D31 to D0
DACKn
CSn
RD
Figure 8.8 Example of DMA Transfer Timing in Single Address Mode
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