I couldn't find an information about GPIO threshold voltage in each document...
I don't need information about timing.
Anyway thank you for your answer.
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I don't think it is in the Module reference. It is in the bcm20737 Datasheet, which is available on the Broadcom Wiced website. Document number 20737-DS100-R,
It's hidden away on page 33 in table 13. There is a gap between the high and the low specification, and the actual crossing threshold is presumably somewhere in the middle of the gap, so yes, there is allowance for hysteresis if I understood the question correctly.