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FIFO Check1/Start
FIFO
full
?
Counter
=FIFOLEV
?
Yes
No
Capture data,
no DMA pending
Increment counter
No
Yes
Generate DMA
Reset counter
FIFO check 2
Yes
No
?
full
FIFO
No
=FIFOLEV
?
Counter
Increment counter
DMA
Capture data,
done
?
DMA
No
Yes
Yes
Yes
Generate DMA
Reset counter
Idle, DMA pending
DMA
No
done
?
PeripheralArchitecture
Figure10.FIFOOperationDuringCardReadDiagram
MultimediaCard(MMC)/SecureDigital(SD)CardController 20SPRUE30B–September2006
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