TC1784
Direct Memory Access Controller (DMA)
User´s Manual
11-6
V1.1, 2011-05
DMA, V3.03
11.2.3
DMA Principles
The DMA controller supports DMA moves from one address location to another one.
DMA moves can be requested either by hardware or by software. DMA hardware
requests are triggered by specific request lines from the peripheral modules or from
other DMA channels (see
). The number of available DMA request lines from
a peripheral module varies depending on the module functionality. Typically, the parallel
occurrence of DMA requests and interrupts requests for DMA channels is possible.
Therefore, the interrupt control unit and the DMA controller can react independently to
interrupt and DMA requests that have been generated by one source.
Figure 11-3 DMA Principle
The DMA controller mainly consists of two DMA Sub-Blocksand a Bus Switch. Once
configured, the DMA Sub-Blocks are able to act as a master on the FPI Bus and on the
LMB Bus.
MCA06151
Request
DMA Controller
DMA
Sub-
Block
0
On - Chip
Peripheral
Unit 1
Request
Request
Bus
Switch
On - Chip
Peripheral
Unit 2
On - Chip
Peripheral
Unit 3
FPI Bus
LMB Bus
DMA Peripheral
Interface
DMA
Sub-
Block
1
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