11.7.4.2 Flush Operation Priority

When a flush request occurs on a suspended channel, if there are pending bytes in the FIFO, they are written out to memory, XDMAC_CISx.FIS is set. If the FIFO is empty, XDMAC_CISx.FIS is also set.
If the flush operation is performed after a disable request, the flush command is ignored. XDMAC_CISx.FIS is not set.

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