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Extra resources for Verilog HDL - A Guide To Digital Design And Synthesis

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When a module is invoked, Verilog creates a unique object from the template. Each object has its own name, variables, parameters, and I/O interface. The process of creating objects from a module template is called instantiation, and the objects are called instances. In Example 2-1, the top-level block creates four instances from the T-flipflop (T_FF) template. Each T_FF instantiates a D_FF and an inverter gate. Each instance must be given a unique name. Note that // is used to denote single-line comments.

For each level of hierarchy from the root module to the desired identifier. n2 Each identifier in the design is uniquely specified by its hierarchical path name. To display the level of hierarchy, use the special character %m in the $display task. See Table 3-4, String Format Specifications, for details. 4 Summary In this chapter, we discussed the following aspects of Verilog: • • • • • Module definitions contain various components. Keywords module and endmodule are mandatory. re optional and can be added as needed.

Design architects define the specifications of the top-level block. Logic designers decide how the design should be structured by breaking up the functionality into blocks and sub-blocks. At the same time, circuit designers are designing optimized circuits for leaf-level cells. They build higher-level cells by using these leaf cells. The flow meets at an intermediate point where the switch-level circuit designers have created a library of leaf cells by using switches, and the logic level designers have designed from top-down until all modules are defined in terms of leaf cells.

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