can i declare a 2D array as following ?

[Altera_Forum]

hi every body 

can i declare a 2D array as following ? type dataout is array (6 downto 0,11 downto 0) of std_logic_vector(7 downto 0); i guess this is a 3D array not 2D. so how i can have a 2d array of std_logic_vector? thank u

[Altera_Forum]

For a 2D array just have one range in the brackets, instead of two. 

 type dataout is array (6 downto 0) of std_logic_vector(7 downto 0);  This will result in an array of 7 std_logic_vectors of range 7 downto 0.

[Altera_Forum]

--- Quote Start ---  For a 2D array just have one range in the brackets, instead of two.  type dataout is array (6 downto 0) of std_logic_vector(7 downto 0);   --- Quote End ---    Nope, thats not a 2d array, thats a 1d array of 1d array. So you access it like this:  output <= dout(x).  A 2d array is declared like the OP posted. He made a 2d array of 1d arrays. You would access it like this:  output <= dout(x,y); --and then add 2nd set of brackets to get individual bits

[Altera_Forum]

thanks a lot my friend! 

  --- Quote Start ---  Nope, thats not a 2d array, thats a 1d array of 1d array. So you access it like this:  output <= dout(x).  A 2d array is declared like the OP posted. He made a 2d array of 1d arrays. You would access it like this:  output <= dout(x,y); --and then add 2nd set of brackets to get individual bits  --- Quote End ---    i wanna initialize this vector, i have a 2d matrix of std_logic_vector can i write like this:    constant d : dataout :=( -- Content -- Address(i,j) "00111100", -- 0,0 "11110000" --0,1 "01100010" --0,2 "01100010" --0,3 ... "01100010", -- 1,0 "10011000", --1,1 "10111000" --1,2 "00111000" --1,3 ... "00111100", -- 2,0 "11110000" --2,1 "01100010" --2,2 "01100010" --2,3 ... ........