[en] According to the importance about non-memory design is risen recently, interest regarding ASIC(Application Specific Integrated Circuit) design. ASIC is the IC designed and manufactured for specific use. And it also called as Custom IC because, mainly for the semi(-specific) custom LSI, it is designed as the requested specification and drawing by customer. But expense and time loss by failure are becoming big burden to manufacture ASIC actually. Accordingly, provided CPLD(Complex Programmable Logic Device) and FPGA(Field Programmable Gate Array) device with design software can verify before manufacture ASIC. In this paper, Designed and verified LCR(Log Count Rate) circuit for ENFMS(Ex-core Neutron Flux Monitoring System) that is used in plant using ALTERA's CPLD and MAX+PLUS II design tool by Graphic editor with simulation