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Section 13 Direct Memory Access Controller (DMAC)
Rev. 4.00 Sep. 14, 2005 Page 405 of 982
REJ09B0023-0400
Section 13 Direct Memory Access Controller (DMAC)
This LSI includes the direct memory access controller (DMAC).
The DMAC can be used in place of the CPU to perform high-speed transfers between external
devices that have
DACK
(transfer request acknowledge signal), external memory, on-chip
memory, memory-mapped external devices, and on-chip peripheral modules.
Figure 13.1 shows a block diagram of the DMAC.
13.1 Features
•
Four channels (Two channels can receive an external request)
•
4-Gbyte physical address space
•
Data transfer unit is selectable: Byte, word (two bytes), longword (four bytes), and 16 bytes
(longword
×
4)
•
Maximum transfer count: 16,777,216 transfers (24 bits)
•
Address mode: Dual address mode and single address mode are supported.
•
Transfer requests
External request
On-chip peripheral module request
Auto request
The following modules can issue an on-chip peripheral module request.
SCIF0, SCIF1, SCIF2, MTU0, MTU1, MTU2, MTU3, MTU4, USB, CMT0, CMT1, A/D
converter 0, A/D converter 1
•
Selectable bus modes
Cycle steal mode (normal mode and intermittent mode)
Burst mode
•
Selectable channel priority levels: The channel priority levels are selectable between fixed
mode and round-robin mode.
•
Interrupt request: An interrupt request can be generated to the CPU at the end of the specified
counts of data transfer.
•
External request detection: There are following four types of
DREQ
input detection.
Low level detection
High level detection
Rising edge level detection
Falling edge level detection
Содержание HD6417641
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