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How are preempted memory accessing by ELCDIF and eDMA?

Question asked by Takashi Kashiwagi on Dec 16, 2018
Latest reply on Jan 21, 2019 by Takashi Kashiwagi
Hi everyone.
 
I have using IMXRT1050-EVKB with MCUXpresso IDE. And I have a question about preemption eDMA and ELCDIF .

Q. When eDMA (SAI) accesses No-Chache memory on SDRAM while ELCDIF is accessing No-Chache memory on SDRAM, how is each access preempted?
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I understood that eDMA Transfer is preempted by DCHPRIn. But I do not know how eDMA and ELCDIF are preempted.
I found the following phenomenon.
・When you are recording / playing audio with SAI_TransferReceiveEDMA / SAI_TransferSendEDMA while drawing the screen with ELCDIF_SetNextBufferAddr, EDMA transfer does not start occasionally.
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Best Regards.
T.Kashiwagi

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