HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 212

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Table 9.6
Addres
s Mode Transfer Category
Single
Dual
B: Burst, C: Cycle steal
Notes: 1. External requests, auto requests and on-chip peripheral module requests are all
Bus Mode and Channel Priority Order: When a given channel (1) is transferring in burst mode
and there is a transfer request to a channel (2) with a higher priority, the transfer of the channel
2. External requests, auto requests and on-chip peripheral module requests are all
3. If the transfer request source is the SCI, cycle steal only.
4. The access size permitted when the transfer destination or source is an on-chip
5. If the transfer request is an external request, channels 0 and 1 only.
External device with DACK and
external memory
External device with DACK and
memory-mapped external device
External memory and external
memory
External memory and memory-
mapped external device
Memory-mapped external device and
memory-mapped external device
External memory and on-chip
memory
External memory and on-chip
peripheral module
Memory-mapped external device and
on-chip memory
Memory-mapped external device and
on-chip peripheral module
On-chip memory and on-chip
memory
On-chip memory and on-chip
peripheral module
On-chip peripheral module and on-
chip peripheral module
available. For on-chip peripheral module requests, however, SCI cannot be specified as
the transfer request source.
available. When the SCI is also the transfer request source, however, the transfer
destination or transfer source must be the SCI respectively.
peripheral module register.
Relationship of Request Modes and Bus Modes by DMA Transfer Category
Request
Mode
External
External
Everything*
Everything*
Everything*
Everything*
Everything*
Everything*
Everything*
Everything*
Everything*
Everything*
1
1
1
1
2
1
2
1
2
2
Bus
Mode
B/C
B/C
B/C
B/C
B/C
B/C
B/C*
B/C
B/C*
B/C
B/C*
B/C*
3
3
3
3
Transfer
Size (bits)
8/16
8/16
8/16
8/16
8/16
8/16
8/16*
8/16
8/16*
8/16
8/16*
8/16*
4
4
4
4
HITACHI 197
Usable
Channels
0,1
0, 1
0–3*
0–3*
0–3*
0–3*
0–3*
0–3*
0–3*
0–3*
0–3*
0–3*
5
5
5
5
5
5
5
5
5
5