Hi Alain RIMLINGER,
From the K8X datasheet, you may know, the SPI operation frequent is 30Mhz, I don't know what the SPI frequent you want to achieve.
If you want to use the FlexIO, the clock speed may be higher, because the FlexIO clock can up to 150Mhz.
More detials about the FlexIO, please refer to this post:
Understanding FlexIO
Wish it helps you!
If you still have question, please contact with me!
Have a great day,
Jingjing
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