using integer arrays in VHDL

[chillimillii]

arrays in vhdl

hi,


i have to use integer arrays in VHDL. the main problem is i have to put integer values into arrays. i dont know how to implement this in VHDL. please help me. Thanks!

 

[avimit]

vhdl array of integers

Dont understand what exactly your problem is.
you can eaisly define a data type like
type int_array is array(0 to N-1) of integer;

then a signal of that type:

signal my_integers : int_array;


now you can eaisly assign values to the array elements like:
my_integers(0) <= 24;
or
my_integers(N-1) <= 100;
Kr,
Avi

 

[craftor]

vhdl 1 & integer

Well, if I want to assign values in array like:

type type_array is array(0 to N-1) of std_logic_vector(o to N-1);
signal tmp : type_array;

how should I do ?

 

[FvM]

array integer vhdl

tmp(i) <= std_logic_vector(conv_unsigned(j,N));

-- respectively conv_signed(), according to your data interpretation

An integer array (with a range to control the bit width) would be possible as well.

By the way, the arithmetic types generally have a downto bit order, thus a std_logic_vector(0 to N-1) would be supplied with inverted bits. Not a problem for the std_logic_vector, but a possible source of confusion when further processing the data.

 

[chillimillii]

implications of using integer in vhdl

Dont understand what exactly your problem is.
you can eaisly define a data type like
type int_array is array(0 to N-1) of integer;

then a signal of that type:

signal my_integers : int_array;


now you can eaisly assign values to the array elements like:
my_integers(0) <= 24;
or
my_integers(N-1) <= 100;
Kr,
Avi

basically i have to use 4x 3 array having its elements as integers in Vhdl (for performing matrix subtraction and multiplication etc etc operations). I don't know exactly declaring and defining this. do you have any idea about it?

 

[FvM]

array 0 to n vhdl

type int_array is array(0 to 3, 0 to 2) of integer range -2**15 to 2**15 -1;

 

[avimit]

integer array in vhdl

You may also break down the array type declaration into 2 steps for clarity like this:
type my_int_array is array(0 to 3) of integer range -2**15 to 2**15 -1;
type my_int_matrix is array (0 to 2) of my_int_array;

Kr,
Avi

 

[vipinlal]

tutorials about arrays in vhdl:
https://vhdlguru.blogspot.com/2010/02/arrays-and-records-in-vhdl.html
tuto about passing arrays to functions and 'packages':
https://vhdlguru.blogspot.com/2010/03/usage-of-packages-and-functions.html