Quartus

VHDL error at <location>: resolution function <name> is used but not declared


CAUSE: In Subtype Declaration or Signal Declaration at the specified location in a VHDL Design File (.vhd), you used the specified resolution function. However, you did not declare the resolution function in a Subprogram Declaration. You must declare a resolution function before you can use it.
ACTION: Replace the resolution function with a previously defined resolution function, or define the resolution function in a Subprogram Declaration. However, do not define a resolution function with the name you used in the Subtype Declaration or Signal Declaration if you already used the name for a different construct.

See also:

Sections 2.1, 2.4, 4.2, and 4.3.1.2 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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