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Identifiers are the names of variables and other elements in verilog code.
a) Any letter or digit may be used
b) The _underscore and $ characters are used
c) Identifiers must not begin with a digit and it should not be a verilog keyword
Example: legal identifiers are a, x1, a_b and byte.
Illegal identifiers are 1a, +b, a*b and 258.
Verilog is case sensitive, hence k is not the same as K and BYTE is not the same as Byte.
Verilog allows a second form of identifier called an escaped identifier. These identifiers are begin with (\) backslash character, which can then be followed by any printable ASCII characters except white spaces.
Example: \234, \sig-name, \x+y
Escaped identifiers should not be used in normal verilogcode, they are intended for use in code produced automatically when other languages are translated into verilog.
Structural level modeling:
In gate level modeling or structural level modeling, the circuit is described in terms of logic gates. Example: and, or, nand, nor, etc... The logic gates have one scalar output and multiple scalar inputs. The first terminal in the list of gate terminals is an output and the other terminals are inputs.
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