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vhdl code for 2 cross 2 matrix

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itsprabhuece

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how to create matrix in vhdl...and how to access ...how to access each value..
 

you can create a 2D array 
Code VHDL - [expand]
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--declaration
type a1 is array (0 to 7, 0 to 7) of std_logic;
signal ar :a1;                                                           -- Declaration of an array
 
--to access
ar(0,0) <= '1';           --  this will set first element to 1


OR

an 1D-1D array....
it is an array of array...
Code VHDL - [expand]
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--declaration
type a1 is array (0 to 7) of std_logic_vector(0 to 7);
signal ar :a1;                                                           -- Declaration of an array
signal arr : a1 :=(others=>(others=>'0'));                     -- Initialization of array
 
--to access
ar(0)(0) <= '1';           --  this will set first element to 1
arr(1) <= "01101000";       -- this will set the row1 to the byte given...


hope it helps.....

- - - Updated - - -

here are some links....you might find helpful....

https://vhdlguru.blogspot.in/2010/02/arrays-and-records-in-vhdl.html
https://vhdlguru.blogspot.in/2010/03/some-tricky-coding-methods-using-vhdl.html
 

note: never create a 2d array of std_logic. It makes your life really difficult. create an array of std_logic_vectors instead. a 2d array of std_logic_vector is fine (but if you want numeric values, dont use std_logic_vector)
 

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