An exhaust gas purification catalyst comprises: an oxygen storage component constituted by a mixed oxide containing cerium and zirconium; and a catalytic metal carried on the oxygen storage component. Discrimination is made between a packet of one’s own station and a relay packet to process the presence and absence of the relay packet without using a CPU to construct a wireless network executing the relay processing at a high speed. The delay locked loop is implemented to measure the period of a reference signal and to mirror the period into a second delay line such that an adjusted reference signal having a frequency approximately equal to the frequency of the reference clock may be generated. Through a CMP process, portions of the oxide layer are removed to substantially planarize the trench-filled oxide layer as the first polysilicon layer. A metallic layer is formed on a second opposing surface of the integrated circuit die.