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When will FlexSPI IPTX/RX DMA request get activated?

Question asked by Stefan Mitterhauser on Mar 2, 2020
Latest reply on Apr 2, 2020 by Stefan Mitterhauser


in the RT1020 reference manual you can find the following explanations for FlexSPI IP TX/RX watermark levels


  1. What does "DMA request whenn filling level is no less than Watermark level" mean? And why is the description for TX/RX the same? Shouldn't it be something like "if TX FIFO count is less or equal to TXWMRK a DMA request will be generated" and for RX "if RX FIFO count is equal or greater than RXWMRK a DMA request will be generated".
  2. When will DMA request be generated?
  3. What is a write window?


Kind regards,