Help me with this counter

[kokei74]

Im having problem with my counter which will control my storage data in ROM to multiply with another ROM. Both rom will stored matrix data. im having a problem with my counter where it only can count from 0 to 15. For my design i need a counter that need to count from 0 - 3 and repeat counting for 4 times then only it can continue count to 4-7(repeat 4 times to).
example of what it should count is like this..

0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 4 5 6 7 4 5 6 7 4 5 6 7 4 5 6 7 8 9 10 11 ..... until 16

i have attached a figure and hope u can understand my prob.

Hope someone can look into my problem. Thanks.


here is my previous counter.

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;

LIBRARY lpm;
USE lpm.lpm_components.all; --functions

ENTITY CounterA IS
PORT (clock : IN STD_LOGIC;

q : OUT STD_LOGIC_VECTOR(3 DOWNTO 0));
END CounterA;

ARCHITECTURE lpm OF CounterA IS
BEGIN
-- Port map 1
U1: lpm_counter
GENERIC MAP (lpm_width => 4, lpm_direction => "up")

PORT MAP (clock => clock,q => q);


END;

 

[jeremylbt]

Use a counter which counts from 0 - 3.
Everytime it counts to 3 increment a variable say x from 1 till 4;

When variable x reaches 4, add a value of 4 to another variable say y and reset x to 1;


The output of the counter will always add to this variable y to produce a final count.

0 1 2 3 x=1 y=0
0 1 2 3 x=2 y=0
0 1 2 3 x=3 y=0
0 1 2 3 x=4 y=4
4 5 6 7 x=1 y=4
4 5 6 7 x=2 y=4
4 5 6 7 x=3 y=4
4 5 6 7 x=4 y=8

and continue till
8 9 10 11 and 12 13 14 15

General idea. Code you write yourself.

 

[kokei74]

Im having trouble coding it myself.

can u help me code it or give an example on how to it?