ASIC (application specific integrated circuit) refers to the integrated circuit designed and manufactured according to the requirements of specific users and the needs of specific electronic systems. Using CPLD (complex programmable logic device) and FPGA (field programmable logic gate array) to design ASIC is one of the most popular ways. Their common feature is that they both have user field programmable characteristics and support boundary scan technology, but they have their own characteristics in integration, speed and programming mode.