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How to Create and Access Bit-matrix?

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Punarva

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i want to create a bit-matrix of 4x32 and want to output each row. I tried writing the below code,

type STD_LOGIC_MATRIX is array(0 to 3, 31 downto 0) of STD_LOGIC;

B0 : out STD_LOGIC(31 downto 0);
B1 : out STD_LOGIC(31 downto 0);
B2 : out STD_LOGIC(31 downto 0);
B3 : out STD_LOGIC(31 downto 0);

signal s : STD_LOGIC_MATRIX;

B0 <= s(0, 31 downto 0);
B1 <= s(0, 31 downto 0);
B2 <= s(0, 31 downto 0);
B3 <= s(0, 31 downto 0);

but its not working properly.
It says "parse error, unexpected DOWNTO, expecting COMMA or CLOSEPAR"
Is there any mistake in creating the datatype? or else accessing signal 's'?
 

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