In practice, we find that unless a project is entirely green field, in addition to a top-down analysis, there is a simultaneous bottom-up analysis of pre-existing code and business logic.
我们在实践中发现，除非一个项目是完全空白的，否则，除了进行自上而下的分析外，还需对预先存在的代码和业务逻辑进行自下而上的分析。
The top-down design method is adopted in the logic design process. And the function of the coder and the decoder has been proved to be correct.
在逻辑设计中，使用了自顶向下的设计方法，正确实现了编码和解码的功能。
According to the method of top-down, FPGA is divided into some logic functional modules. The designing method of every module is discussed in detail.
设计中采用了自顶向下的方法，将FPGA依据逻辑功能划分为几个模块，详细论述了各模块的设计方法。
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