programmable logic device English full name: programmable logic device is PLD. PLD is produced as a general integrated circuit, and its logic function is determined according to the user's device programming. The integration degree of general PLD is high enough to meet the general number of design The needs of the cosmic system. At present, EEPROM is commonly used. CPLD, FPGAQ. PLA,PAL CAL was an early programmable device that has been phased out. Programmable Logic Device (PLD) is an important branch of ASIC. It is a semi-customized circuit produced by manufacturers as a universal device. Users can program the device to achieve the required functions.