Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
982
Note: The LLI.DMAC_SADDRx, LLI. DMAC_DADDRx, LLI.DMAC_DSCRx, LLI.DMAC_CTRLAx and LLI.DMAC_CTRLBx
registers are fetched. The DMAC automatically reprograms the DMAC_SADDRx, DMAC_DADDRx, DMAC_DSCRx,
DMAC_CTRLBx and DMAC_CTRLAx channel registers from the DMAC_DSCRx(0).
15. Source and destination request single and chunk DMAC transactions to transfer the buffer of data (assuming
non-memory peripheral). The DMAC acknowledges at the completion of every transaction (chunk and
single) in the buffer and carry out the buffer transfer.
16. Once the buffer of data is transferred, the DMAC_CTRLAx register is written out to system memory at the
same location and on the same layer (DMAC_DSCRx.DSCR_IF) where it was originally fetched, that is, the
location of the DMAC_CTRLAx register of the linked list item fetched prior to the start of the buffer transfer.
Only DMAC_CTRLAx register is written out because only the DMAC_CTRLAx.BTSIZE and
DMAC_CTRLAX.DONE bits have been updated by DMAC hardware. Additionally, the
DMAC_CTRLAx.DONE bit is asserted when the buffer transfer has completed.
Note: Do not poll the DMAC_CTRLAx.DONE bit in the DMAC memory map. Instead, poll the LLI.DMAC_CTRLAx.DONE bit
in the LLI for that buffer. If the poll LLI.DMAC_CTRLAx.DONE bit is asserted, then this buffer transfer has completed.
This LLI.DMAC_CTRLAx.DONE bit was cleared at the start of the transfer.
17. The DMAC does not wait for the buffer interrupt to be cleared, but continues fetching the next LLI from the
memory location pointed to by current DMAC_DSCRx register and automatically reprograms the
DMAC_SADDRx, DMAC_DADDRx, DMAC_DSCRx, DMAC_CTRLAx and DMAC_CTRLBx channel
registers. The DMAC transfer continues until the DMAC determines that the DMAC_CTRLBx and
DMAC_DSCRx registers at the end of a buffer transfer match described in Row 1 of Table 40-2 on page
978. The DMAC then knows that the previous buffer transferred was the last buffer in the DMAC transfer.
The DMAC transfer might look like that shown in Figure 40-6.
Figure 40-6. Multi-buffer with Linked List Address for Source and Destination
If the user needs to execute a DMAC transfer where the source and destination address are contiguous but the
amount of data to be transferred is greater than the maximum buffer size DMAC_CTRLAx.BTSIZE, then this can
be achieved using the type of multi-buffer transfer as shown in Figure 40-7.
SADDR(2)
SADDR(1)
SADDR(0)
DADDR(2)
DADDR(1)
DADDR(0)
Buffer 2
Buffer 1
Buffer 0
Buffer 0
Buffer 1
Buffer 2
Address of
Source Layer
Address of
Destination Layer
Source Buffers Destination Buffers