Renesas SH7641 - Manual (Page 485)

Section 13 Direct Memory Access Controller (DMAC)
Rev. 4.00 Sep. 14, 2005 Page 435 of 982
REJ09B0023-0400
DMAC
This LSI
DACK
DREQ
External address bus External data bus
External
memory
External device
with DACK
Data flow
Figure 13.7 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.