JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year DIGITAL DESIGN USING VERILOG HDL Previous Question Paper (December - 2018 - R13)

Concurrency refers to the execution of multiple statements or processes simultaneously within a hardware description language. In Verilog, this means that all procedural blocks (such as always and initial blocks) and continuous assignments operate in parallel, reflecting the inherent parallel nature of digital hardware circuits.

In Verilog HDL, identifiers are user-defined names assigned to objects such as modules, variables, signals, tasks, and functions. They serve as unique labels to reference these elements within the code.

The rules for defining identifiers are as follows:

• They can contain letters (a-z, A-Z), digits (0-9), the underscore character (_), and the dollar sign ($).
• The first character of an identifier must be a letter or an underscore; it cannot be a digit or a dollar sign.
• Identifiers are case-sensitive, meaning Data_Bus and data_bus are treated as distinct names.
• They cannot be a Verilog reserved keyword.
• While there is no explicit limit on length, identifiers should be kept concise and descriptive to improve code readability.