Table 14.7 Relationship between DMA Transfer Type, Request Mode, and Bus Mode
Address
Mode
Request
Mode
Bus
Mode
Transfer Size Usable
Type of Transfer
(Bits)
Channels
6
6
*
Single
External device with DACK
and external memory
External
B/C
B/C
8/16/32/64/32B 0, 1 (2, 3)
*
External device with DACK
and memory-mapped
external device
External
8/16/32/64/32B 0, 1 (2, 3)
1
*
*5 *6
*5 *6
Dual
External memory and
external memory
Internal
B/C
B/C
8/16/32/64/32B 0, 1, 2, 3
7
7
*
External
1
*
External memory and
memory-mapped external
device
Internal
External
8/16/32/64/32B 0, 1, 2, 3
*
1
*
*5 *6
Memory-mapped external
Internal
B/C
8/16/32/64/32B 0, 1, 2, 3
7
*
device and memory-mapped External
external device
2
3
4
*
*
*
*5 *6
*5 *6
External memory and
on-chip peripheral module
Internal
B/C
8/16/32/64
8/16/32/64
0, 1, 2, 3
2
*
3
4
*
B/C
*
Memory-mapped external
device and on-chip
Internal
0, 1, 2, 3
peripheral module
32B:
B:
32-byte burst transfer
Burst
C:
Cycle steal
External: External request
Internal: Auto-request or on-chip peripheral module request
Notes: *1 External request, auto-request, or on-chip peripheral module request (TMU input
capture interrupt request) possible. In the case of an on-chip peripheral module request,
it is not possible to specify external memory data transfer with the SCI (SCIF) as the
transfer request source.
*2 External request, auto-request, or on-chip peripheral module request possible. If the
transfer request source is the SCI (SCIF), either the transfer source must be SCRDR1
(SCFRDR2) or the transfer destination must be SCTDR1 (SCFTDR2).
*3 When the transfer request source is the SCI (SCIF), only cycle steal mode can be used.
*4 Access size permitted for the on-chip peripheral module register that is the transfer
source or transfer destination.
*5 When the transfer request is an external request, only channels 0 and 1 can be used.
*6 In DDT mode, transfer requests can be accepted for all channels from external devices
capable of DTR format output.
*7 See tables 14.8 and 14.9 for the transfer sources and transfer destinations in DMA
transfer by means of an external request.
Rev. 6.0, 07/02, page 524 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
