An identifier in Verilog and SystemVerilog is the user-specified name of some object, such as the name of a module, wire, variable, or function. Verilog and System Verilog are case-sensitive languages, meaning that lowercase letters and uppercase letters are perceived as different in identifiers and in keywords. Keywords are always in all lowercase letters. User-created identifiers can use a mix of lowercase and uppercase letters, as well as numbers and the special characters _, $, and \ (the latter is an escape character).
KeywordsSign Extension Size Mismatch Input Logic Input Wire Automatic Storage
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