This paper introduces the VHDL top down design method including scheme determination, hierarchy division, and VHDL application taking a digital code lock design for example.
文中以数字密码锁的设计为实例，从方案的确定，各阶层的划分，VHDL的应用，介绍了VHDL自顶向下的设计方法。
The scheme determination of long distance gas transmission pipeline is analyzed, and the optimized design calculation of long distance gas transmission pipeline is discussed.
分析了长距离输气管道方案的确定，探讨了长输管道的优化设计计算。
The scheme determination of long distance gas transmission pipeline is analyzed, and the optimized design calculation of long distance gas transmission pipeline is discussed.
分析了长距离输气管道方案的确定，探讨了长输管道的优化设计计算。
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