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Meaning of setting port speed

Dear All,
Reference MCU STM32F4
As we all well aware the following code for set the speed of the port pins

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

Is this saying the signals come to the port pin's more than 50MHz will not capture and the port can not sends signals more than 50MHz frequency? Am I correct?

Please advice

It would be much appreciated if some one can give me a some links taking about this information since it does not have in the ARM manuals

Thanks in advance

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