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EFR turbo speed sensor - frequency question!

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I need to clarify a detail that was not specified in the manual but is important for my use case.
The mentioned maximum input frequency applied to any DI pin is that calculated by the sampling rate or by the Nyquist frequency. I assume it is the latter one, but I just want to make sure. 

The use-case is the following one. I need to connect a turbo speed sensor to a Link G4 but have to divide the signal with a DFlipFlop array. I just want to make sure, I am choosing the right divisor ;).


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On 2/18/2020 at 8:53 PM, Adamw said:

On top of Richards reply I can say a divide by 8 has worked well for me, with 12 blades @ 190000RPM.

Sorry, I just noticed that circuit I posted was drawn for divide by 16 (I have used both /8 and /16 with no noticable difference in result).  For divide by 8 you would connect pin 9 to the ECU instead of pin 6 as drawn.

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