Verilog-2001 lets you use variables to select a group of bits from a vector.
Define the variable part select by the starting point of its range and the vector's width, rather than by two explicit bounds.The starting point of the part select can vary. The width of the part select remains constant.
The following table lists the variable part selects symbols.
| Symbol | Meaning |
|---|---|
| + (plus) | The part select increases from the starting point. |
| - (minus) | The part select decreases from the starting point |