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AN4031 датащи(PDF) 14 Page - STMicroelectronics

номер детали AN4031
подробное описание детали  Using the STM32F2 and STM32F4 DMA controller
PDF  36 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4031 датащи(HTML) 14 Page - STMicroelectronics

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DMA controller description
AN4031
14/36
DocID022648 Rev 1
1.1.11
Double-buffer mode
A double-buffer stream works as a regular (single-buffer) stream, with the difference that it
has two memory pointers. When the Double-buffer mode is enabled, the Circular mode is
automatically enabled and at each end of transaction (DMA_SxNDTR register reach 0), the
memory pointers are swapped.
This allows the software to process one memory area while the second memory area is
being filled/used by the DMA transfer.
Figure 6. Double-buffer mode
Table 6. Possible burst configurations
MSIZE
FIFO level
MBURST = INCR4
MBURST = INCR8
MBURST = INCR16
Byte
1/4
1 burst of 4 bytes
forbidden
forbidden
1/2
2 bursts of 4 bytes
1 burst of 8 bytes
3/4
3 bursts of 4 bytes
forbidden
Full
4 bursts of 4 bytes
2 bursts of 8 bytes
1 burst of 16 bytes
Half-word
1/4
forbidden
forbidden
forbidden
1/2
1 burst of 4 half-words
3/4
forbidden
Full
2 bursts of 4 half-words 1 burst of 8 Half-word
Word
1/4
forbidden
forbidden
1/2
3/4
Full
1 burst of 4 words



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