Clock control circuit and method

摘要

A clock controlling circuit and method for eliminating the delay difference in the entire clock propagation line. Circuit scale is reduced as compared to a case of using a PLL or DLL circuit. A timing averaging circuit 10 is fed with clocks from a position on a forward route 11 ₁ of a direction-reversed clock propagation path, adapted for being fed with input clocks at its one end, and from a position on a return route 11 ₂ corresponding to the position on the forward route 11 ₁. The timing difference between these clocks is averaged to output an averaged timing difference.