brief introduction： Introduction:A Complex Programmable Logic Device (CPLD) is an IC that can be configured to perform arbitrary logic functions. They are usually configured through a special set of access pins called a JTAG port, named after the Joint Test Action Group, which defined the protocol, but programming methods are proprietary and may vary by manufacturer. A CPLD is non-volatile, meaning that the programmed state is retained even if power is removed. CPLDs are available that have more than one hundred IO

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