Vector
Description
Vector is another name for a onedimensional array. It is used in
particular for the arrays with elements of logical types: bit and
std_logic (bit_vector and std_logic_vector, respectively).
Examples
signal DataBus :
Bit_Vector(7 downto 0);
. . .
DataBus <= "11000011";
Important Notes

Vectors of logical values are not directly transferable to integer
values. Neither Standard package nor Std_Logic_1164 package define
any conversion functions from logical vector to an integer or
viceversa. Most synthesis tools, however, support such functions
(although these functions are toolspecific).

No arithmetic functions are allowed on logical vectors.
