This paper briefly introduces the structures and features of programmable logic device CPLD and FPGA, and emphatically presents the characteristics of VHDL language and the reasons of choosing VHDL.

• 简要介绍了可编程逻辑器件 CPL D和 FPGA的结构和特点 ,着重介绍了 VHDL 语言的特点及选择 VHDL 的理由。