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Extract Some Data From A Signal By Timer

Question asked by soheili.mehdi on Nov 20, 2016
Latest reply on Nov 21, 2016 by soheili.mehdi
Hi Guys
i have a board(a) and this board send some async data with clock to my stm32f4 device.
in this data transferred by board(a) have some dummy clock and i want reject this dummy clock.


i want to capture input clock by timer and count clock and make a signal like signal3 on above picture.
signal3 will connect to a buffer chip OE (Output Enable) pin to accept real data & real clock and reject extra dummy clock.
how can i do this by timer?
data input clock from board(a) is around 20MHz.
tnx for help me