In a first information processing apparatus, data in a first format is stored. The optical waveguide has a direction changing portion that changes the travel direction of the guided light. For example, both of the p-channel load transistors and one of the n-channel driver transistors in each memory cell may be constructed with a compressive nitride liner layer while the other driver transistor is constructed with a tensile nitride liner layer. The method and apparatus determines an oscillator signal based upon the phase error.