Dependable clock distribution for crosstalk aware design

In order to guarantee proper junction of a system, a correct clock signal must be distributed. This paper proposes two methods for distributing the clock signal that take account of crosstalk noises generated on the clock signal line, which are applicable to conventional synchronous digital systems. For the clock signal of a pulse type, we propose a multiple clock pulse method that has the tolerance for an incorrect clock pulse induced by a crosstalk fault. For the clock signal of a level sensitive type, we propose a self-correction method for the change of the clock signal width during system operation. The circuits implemented by both methods can be inserted into clock signal lines as adapter circuits for the conventional clocked element and flip-flop, and as a result, the proposed methods are easily built in conventional synchronous digital circuits. We show effectiveness of our design by circuit simulation for the conventional flip-flop.