Potential Problems to Avoid (cont. 1)

Avoid using shared variables
- Debugging potential asynchronous errors can be difficult
- Concept likely to change in future VHDL standards
Overloaded items cannot be resolved by return type
- Example: These overloaded functions cannot be disambiguated:
  FUNCTION "-" (a, b: natural) RETURN integer; FUNCTION "-" (a, b: natural) RETURN natural;