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GPIO wait states

Question asked by Andres Gonzalez on Jan 19, 2015
Latest reply on Jan 22, 2015 by Andres Gonzalez



In the i.MX6 Solo reference manual it is mentioned the following for the GPIO pad status register.


Two wait states are required any time this register is accessed for synchronization.


However we don't understand what that exactly means and also if this require any special action from the software when reading the register.


If somebody can help us answering the following questions we would be very grateful.


  • Does this mean that the hardware takes two wait states to synchronize  the register once the GPIO pin changed?.
  • What considerations should the software take to account for these wait states?.
  • How long a wait state is?.