ID:18261 VHDL Variable Declaration warning at <location>: used initial value expression "<string>" for variable "<name>" because variable was never assigned a value

CAUSE: In a VHDL Design File (.vhd) at the specified location, you declared the specified variable, which you later used in an expression or on the right-hand side (RHS) of an assignment. However, you never assigned a value to the variable with a Variable Assignment Statement. As a result, Quartus Prime Integrated Synthesis used the initial value expression you specified in the Variable Declaration for the variable.

ACTION: If you intended to use the initial value expression for the variable, no action is required. Otherwise, assign a value to the variable before using the variable in expressions or on the RHS of assignments.