We have questions about ECSPI of i.MX6SDL.
There is "Max operation frequency up to the reference clock frequency" in Chapter 21.1.1 of Reference Manual (IMX6SDLRM Rev.1).
But we do not know it well, please tell us about the following.
Does "Max operation frequency" mean operating frequency of the internal ECSPI module ?
Or does it mean communication frequency with external devices connected with SPI ?
Which clock is "The reference clock frequency" in Table 21-6 ?