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An array is an ordered data structure consisting of a collection of elements (values or variables), each identified by one (single dimensional array, or vector) or multiple indexes.
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VHDL mux in need of generics
subtype T_SLV_8 is STD_LOGIC_VECTOR(7 downto 0); -- define a Byte
type T_SLVV_8 is array(NATURAL range <>) of T_SLV_8; -- define a new unconstrained vector of Bytes. … VHDL has a problem to define array of unconstrained arrays (this is solved with VHDL-2008, but not all vendors support this feature).
So solution 2 uses a flat vector to pass all bits to the mux. …