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VHDL warning at <location>: used initial value for variable <name> because it was never assigned

CAUSE: In a VHDL Design File (.vhd) at the specified location, you made an assignment using a variable that was never assigned.
ACTION: Assign the variable to a known value, and then use the variable to assign to another variable.

See also:

Sections 4.2.1.3 and 8.5 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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