Verilog-2001 Variable Part Selects - 2023.1 English

Vivado Design Suite User Guide: Synthesis (UG901)

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2023.1 English

Verilog-2001 lets you use variables to select a group of bits from a vector.

Instead of being bounded by two explicit values, the variable part select is defined by the starting point of its range and the width of the vector. 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.

Table 1. Variable Part Selects Symbols
Symbol Meaning
+ (plus) The part select increases from the starting point.
- (minus) The part select decreases from the starting point