Motorola MSC8101 ADS User's Guide Page 112

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6-4 MSC8101 User’s Guide
DMA Channels
6.1.2.1 Memory to DMA FIFO
A memory transfer to the DMA FIFO can occur from either external or internal memory.
Figure 6-3 shows both possibilities. Note that in memory/DMA FIFO transactions, both
directions, the channel is programmed to internal request mode (DCHCRx[25]:INT=1).
Figure 6-3. Memory to DMA FIFO Transfers
6.1.2.2 DMA FIFO to Memory
A DMA FIFO to memory can access either external or internal memory. Figure 6-4
shows both possibilities.
Figure 6-4. DMA FIFO to Memory Transfers
DMA
FIFO
SIU
PowerPC Local
PowerPC System
512 KB
SRAM
MEMC
DMA
FIFO
MEMC
SIU
PowerPC Local
PowerPC System
External
Memory
MEMC
Internal Memory Transfer External Memory Transfer
MEMC
DMA
FIFO
MEMC
SIU
PowerPC Local
PowerPC System
512 KB
SRAM
MEMC
DMA
FIFO
MEMC
SIU
PowerPC Local
PowerPC System
External
Memory
MEMC
Internal Memory Transfer External Memory Transfer
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