Section 14 Direct Memory Access Controller (DMAC)
Rev.1.00 Dec. 13, 2005 Page 557 of 1286
REJ09B0158-0100
Section 14 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 (DMA transfer end notification), external memory, on-chip memory,
memory-mapped external devices, and peripheral modules.
14.1 Features
•
Twelve channels (four channels can receive an external request: channel 0 to 3)
•
4-Gbyte physical address space
•
Data transfer unit is selectable: Byte, word (2 bytes), longword (4 bytes), 16 bytes, and 32
bytes
•
Maximum transfer count: 16,777,216 transfers
•
Address mode: Dual address mode
•
Transfer requests:
External request (channel 0 to 3), peripheral module request (channel 0 to 5), or auto request
can be selected.
The following modules can issue an peripheral module request.
SCIF0, SCIF1, HAC, HSPI, SIOF, SSI, FLCTL, and MMCIF
•
Selectable bus modes:
Cycle steal mode (normal mode and intermittent mode) or burst mode can be selected.
•
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 after half of the transfers
ended, all transfers ended, or an address error occurred.
•
External request detection: There are following four types of DREQn input detection.
(n = 0 to 3)
Low level detection (Initial value)
High level detection
Rising edge detection
Falling edge detection
•
Transfer end notification signal:
Active levels for both DACKn and DRAKn can be set independently.
(n = 0 to 3, Initial value: low active)
Содержание SH7780 Series
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