VHDL generics

VHDL type	Verilog type
integer	integer or real
real	integer or real
time	integer or real
physical	integer or real
enumeration	integer or real
string	string literal

When a scalar type receives a real value, the real is converted to an integer by truncating the decimal portion.

Type time is treated specially: the Verilog number is converted to a time value according to the `timescale directive of the module.

Physical and enumeration types receive a value that corresponds to the position number indicated by the Verilog number. In VHDL this is equivalent to T'VAL(P), where T is the type, VAL is the predefined function attribute that returns a value given a position number, and P is the position number.

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