A discussion about two JTAG interfaces convenient to debug,extended Ethernet interface and the design of A/D interface converted from serial IIS by CPLD is carried out.

• 本文重点讨论了方便调试的两种JTAG接口、扩展的以太网接口和利用CPLD将串行IIS转换成并行总线的A/D接口的设计。