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VHDL Type Declaration error at <location>: range constraint bounds for physical type must have integer type

CAUSE: In a Type Declaration at the specified location in a VHDL Design File (.vhd), you declared a physical type. However, one or both bounds of the physical type's range constraint does not have an integer type. Both bounds must have an integer type.
ACTION: Change the range constraint bounds so they both have an integer type.

See also:

Sections 3.1.3 and 4.1 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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