An electronic device includes: a first input node configured to receive a dock signal; a second input node configured to receive an activation signal or a deactivation signal; a filter circuit responsive to: (a) the activation signal to activate the filter circuit to block the dock signal; or (b) the deactivation signal to deactivate the filter circuit to pass the dock signal; and an output node configured for coupling to a synchronous I/O interface of an integrated circuit to control operation of the synchronous I/O interface.