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help with synthesizing the code

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kakarala

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Hii

i am trying to synthesize a code i wrote for computing motion estimation, when i am trying to synthesize the code , the program goes on executing and my computer is running out of memory me_engine.vhd is the top block.
 

Dont use for loops so careless. It will use up all the resources and take ages to synthesis.For example see the below cascaded for loops you have used in your code:

Code: 
compensation : process(clk)
 begin
--  for x in 0 to (IM_ROWS/BLK_ROWS)-1 loop
--    for y in 0 to (IM_COLUMNS/BLK_COLUMNS)-1 loop 
   if (clk ='1' and clk'event) then	     
   for x in 0 to 29 loop
    for y in 0 to 43 loop 
--		  for i in x*(IM_ROWS/BLK_ROWS)  to ((x+1)*(IM_ROWS/BLK_ROWS)) - 1 loop
--	       for j in x*(IM_COLUMNS/BLK_COLUMNS)  to ((x+1)*(IM_COLUMNS/BLK_COLUMNS)) - 1 loop
       for i in x*(8)  to ((x+1)*(8)) - 1 loop
	        for j in y*(8)  to ((y+1)*(8)) - 1 loop
			 			 	 
			   motion_compensated(i,j) <= reference_image(i+motion_vectors(index1,0),j+motion_vectors(index1,1));
				
			 end loop;
        end loop;	
        index1 <= index1 + 1;
     end loop;
  end loop;
   end if;
end process;


Here the loop has a size of 30*44*7*7 = 64680.

Instead of such for loops use a clocked process and do the calculation at each clock edge.This may require more clock cycles to compute the result but will not give your PC hang.

--vipin
https://vhdlguru.blogspot.com/
 
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