Verilog HDL是一种硬件描述语言（HDL:Hardware Discr iption Language），是一种以文本形式来描述数字系统硬件的结构和行为的语言，用它可以表示逻辑电路图、逻辑表达式，还可以表示数字逻辑系统所完成的逻辑功能。 -VHDL language is a high-level language for circuit design, digital systems primarily used to describe the structure, behavior, functionality and interfaces. Its application is mainly used in digital circuit design. In the FPGA/CPLD/EPLD/ASIC design, such as defining the chip pin functions.