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how to declare 2D vector of type unsigned?

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signal some_vector : unsigned ( 7 downto 0 ) ; -- ( 7 downto 0 ) is just an example
 

for a 2d vector:

Code: 
type my_array_t is array(natural range <>, natural range <>) of unsigned(7 downto 0);
signal my_array : my_array_t(1 downto 0, 10000 downto 623);
 
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A vector is a set of single bits (my example):
xxxxxxxx

An array is a set of vectors of the same length (TrickyDicky's example)
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx

Which one are you asking about?
 
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