An input block is provided that includes a user-controlled, variable-delay input circuit. The input circuit is adapted to receive an input signal and to output a delayed version of the input signal on an output node. A number of control signals dictate the amount of delay imposed on the input signal. The control signals, and therefore the amount of delay, are established using a control-signal generator. The generator can be used to actively alter the delay. In one embodiment, the control signal generator is implemented as a feedback circuit that automatically matches the delay period of the delay circuit with the delay period of a distributed clock signal.