Identifiers - verilog code

IDENTIFIERS

Rules:

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.