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Message: [QUOTE="Jim Lewis, post: 5109553"] Prior to VHDL-2008, a locally static expression required the operands and result to be scalar. VHDL-2008 drops the scalar requirement and explicitly adds some IEEE packages (see text below). In short, it should work in VHDL-2008. From VHDL-2002, 7.4.1 P113 "7.4.1 Locally static primaries An expression is said to be locally static if and only if every operator in the expression denotes an implicitly defined operator whose operands and result are _scalar_ and" From VHDL-2008, 7.4.2, P139 "9.4.2 Locally static primaries An expression is said to be locally static if and only if every operator in the expression denotes an implicitly defined operator or an operator defined in one of the packages STD_LOGIC_1164, NUMERIC_BIT, NUMERIC_STD, NUMERIC_BIT_UNSIGNED, or NUMERIC_STD_UNSIGNED in library IEEE, and if every primary in the expression is a locally static primary, where a locally static primary is defined to be one of the following:" Jim [/QUOTE]