nRF52840 GPIO timing question

Question

We intend to connect an A-D converter to GPIO lines in SPI mode. The ADC generates a done pulse that is positive 3.3V and 56ns to 64ns wide. 
 
 Looking at v1.1 datasheet ... GPIO 6.10.5 discusses output Rise/fall times, but nothing about inputs. 
 
 And the GPIOTE section, 6.10.5 Electrical specification is blank. 
 
 So the question is, can a GPIOTE reliably respond to a pulse this narrow?

GlennF · Accepted Answer

So, we wrote a quick test app and I verified that it reliably responds to a 20 ns wide pulse. My generator doesn't create pulses more narrow that this, so I couldn't find its pain threshold, but this reassures me that it should do fine with a 56 ns pulse width.

nRF52840 GPIO timing question

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