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Max Baud Rate and Transfer size for SPI SDMA Transfers

Question asked by on Apr 9, 2019
Latest reply on Jun 26, 2019 by Diego Adrian Cuevas

I am using the SPI SDMA to transfer information. I would like to know if there is a limit on the baud rate when using this. My transfers are failing when I try to do a larger transfer at a high baud rate. Is there a Max baud rate for the spi sdma based transfer? I am seeing this on the Cortex M4 for the IMX8MM and IMX8MQ. Is anyone else seeing this? Below are my results, I am using a loopback functionality to test my results. Any suggestion on what I can do to get a faster rate working with a larger transfer size.


Size      Rate         Result

64         500k Hz   Pass

256       500k Hz   Pass

64         10MHz     Intermittent Pass/Fail

128       10MHz     Fail

256       10M Hz    Fail