HD6417751 Datasheet, PDF (539/1105 Pages) Renesas Technology Corp – SuperH RISC engine

Relationship between DMA Transfer Type, Request Mode, and Bus Mode
Table 14.7 shows the relationship between the type of DMA transfer, the request mode, and the
bus mode.
Table 14.7 Relationship between DMA Transfer Type, Request Mode, and Bus Mode
Address
Mode Type of Transfer
Request Bus Transfer Size Usable
Mode
Mode (Bits)
Channels
Single
External device with DACK
and external memory
External B/C
8/16/32/64/32B 0, 1 (2, 3)*⁶
External device with DACK External B/C
and memory-mapped external
device
8/16/32/64/32B 0, 1 (2, 3)*⁶
Dual
External memory and external Internal*¹, B/C
memory
external*⁷
8/16/32/64/32B 0, 1, 2, 3*^5,*⁶
External memory and memory- Internal*¹, B/C
mapped external device
external*⁷
8/16/32/64/32B 0, 1, 2, 3*^5,*⁶
Memory-mapped external
device and memory-mapped
external device
Internal*¹, B/C
external*⁷
8/16/32/64/32B 0, 1, 2, 3*^5,*⁶
External memory and
on-chip peripheral module
Internal*² B/C*³ 8/16/32/64*⁴ 0, 1, 2, 3*^5,*⁶
Memory-mapped external
device and on-chip
peripheral module
Internal*² B/C*³ 8/16/32/64*⁴ 0, 1, 2, 3*^5,*⁶
32B:
B:
32-byte burst transfer
Burst
C:
Cycle steal
External: External request
Internal: Auto request, 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 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.
Rev. 3.0, 04/02, page 499 of 1064