OPERATORS VHDL has a wide set of operators. These are specific to the data types, all operators do not operate on every data types. They are further divided into groups of the same precedence level (priority).Table below shows all operators as per their precedance low to high, row-1 has the lowest priority whereas operators of row-7 has the highest priority. Within each row the priority is from left to right with the leftmost having highest priority. Class Operator Precedence Low             high  Same Operator Precedence (Applied Left –to-Right) 1. Logical operators and or nand nor xor xnor 2. Relational operators = /= < <= > >= 3. Shift operators sll srl sla sra rol ror 4.Addition operators + = & 5. Unary operators + - 6. Multiplying op. * / mod rem 7. Miscellaneous op. ** abs not The order of precedence is the highest for the operators of class 7, followed by class 6 with the lowest precedence for class 1. Unless parentheses are