We further divide the small block to leaf cells which cannot be further divided. Top-Down Methodology: In Top-Down we first identify or define the big circuit or big block and then identify a small block used to make this big block. There are two design approaches when writing code in hierarchical style to divide the big complex circuit into smaller modules and further dividing these modules to even smaller modules like gates etc. The key idea is to divide and conquer i.e. Hierarchical Designing: A Hierarchical methodology is used to design simple components to construct more complex component. This tutorial will further provide some examples and explain why it is better to code in a hierarchical style. In “ Introduction to Verilog” we have mentioned that it is a good practice to write modules for each block. This tutorial focuses on writing Verilog code in a hierarchical style.
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January 2023
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