本文从walkcr硬件模型出发, 分别论 述了vhdl对不同的硬件抽象领域和层次 的描述能力, 并给出了相应的vhdl描述 结构.-In this paper, the starting walkcr hardware model, which describes respectively vhdl hardware abstraction for different areas and levels of descr iption capability, and gives the