TABLE OF CONTENTS Operators in Verilog can be divided into several categories. One way to categorize the operators is by the number of operands they take. For example, the + symbol takes two operands, as in a + b. When an operator takes two operands, it is called a binary operator. Verilog, like most programming languages, has many binary operators. Verilog also includes unary operators (which take only one operand), and a ternary operator (which takes three operands).
Another way to group the operators is by the size of what they return. Some operators, when operating on vectors, return a vector. But two types of operators return a single-bit value even if they are passed vectors. The operators that return only a single bit are either reduction or logical operators.
Most of the operators in Verilog take two operands, and fall into the category ot binary operators. This includes a set of arithmetic, bit-wise, and logical operators.
| Symbol | Description |
|---|---|
| + | Addition |
| ? | Subtraction |
| * | Multiplication |
| / | Division |
| % | Modulus (remainder) |
| ** | Power (exponent) New in IEEE1364-2001 |
The definitions of the arithmetic operators are similar to other programming languages. IEEE 1364-2001 adds the power operator that was previously not part of Verilog.
| Symbol | Description |
|---|---|
|
| OR |
| & | AND |
| ? | Exclusive OR |
| << | Shift left |
| <<< | Signed shift left New in IEEE1364-2001 |
| >> | Shift right |
| >>> | Signed shift right New in IEEE1364-2001 |
The bit-wise I, &, and ? operators...
