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i.MX7: Maximum read speed on ECSPI is 23 Mbit/s? Or is it 52 Mbit/s?

Question asked by Jonah Petri on Jan 18, 2017
Latest reply on Jan 18, 2017 by John Watlington



On the modules listing of the i.MX7 datasheet[1], it says of the ECSPI peripherals: "Full-duplex enhanced Synchronous Serial Interface, with data rate up to 52 Mbit/s."


However, digging into the datasheet SPI timing (section it says that the minimum SCLK cycle timing is actually 43 ns, which is actually only 23 Mbit/s.


This seems pretty misleading, yes?  Perhaps the datasheet should be corrected to reflect that it can only achieve 52 Mbit/sec in write-only mode, and full-duplex mode is limited to 23 Mbit/s?


Or am I reading it wrong?