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| LIBRARY ieee; | |||
| USE ieee.std_logic_1164.ALL; | |||
| USE ieee.std_logic_signed.ALL; | |||
| USE ieee.numeric_std.ALL; | |||
| PACKAGE used_functions_pkg IS | |||
| FUNCTION log2_sup_integer (number : natural) RETURN natural; | |||
| FUNCTION log2_inf_integer (number : natural) RETURN natural; | |||
| END PACKAGE; | |||
| PACKAGE BODY used_functions_pkg IS | |||
| --functions | |||
| FUNCTION log2_sup_integer (number : natural) RETURN natural IS | |||
| VARIABLE result : natural; | |||
| BEGIN | |||
| IF(number <= 1) THEN | |||
| result := 0; | |||
| ELSIF(number = 2) THEN | |||
| result := 1; | |||
| ELSIF(number > 2 AND number <= 4) THEN | |||
| result := 2; | |||
| ELSIF(number > 4 AND number <= 8) THEN | |||
| result := 3; | |||
| ELSIF(number > 8 AND number <= 16) THEN | |||
| result := 4; | |||
| ELSIF(number > 16 AND number <= 32) THEN | |||
| result := 5; | |||
| ELSIF(number > 32 AND number <= 64) THEN | |||
| result := 6; | |||
| ELSIF(number > 64 AND number <= 128) THEN | |||
| result := 7; | |||
| ELSIF(number > 128 AND number <= 256) THEN | |||
| result := 8; | |||
| ELSIF(number > 256 AND number <= 512) THEN | |||
| result := 9; | |||
| ELSIF(number > 512 AND number <= 1024) THEN | |||
| result := 10; | |||
| ELSIF(number > 1024 AND number <= 2048) THEN | |||
| result := 11; | |||
| ELSIF(number > 2048 AND number <= 4096) THEN | |||
| result := 12; | |||
| ELSIF(number > 4096 AND number <= 8192) THEN | |||
| result := 13; | |||
| ELSIF(number > 8192 AND number <= 16384) THEN | |||
| result := 14; | |||
| ELSIF(number > 16384 AND number <= 32768) THEN | |||
| result := 15; | |||
| END IF; | |||
| RETURN result; | |||
| END FUNCTION; | |||
| FUNCTION log2_inf_integer (number : natural) RETURN natural IS | |||
| VARIABLE result : natural; | |||
| BEGIN | |||
| IF(number < 2) THEN | |||
| result := 0; | |||
| ELSIF(number >= 2 AND number < 4) THEN | |||
| result := 1; | |||
| ELSIF(number >= 4 AND number < 8) THEN | |||
| result := 2; | |||
| ELSIF(number >= 8 AND number < 16) THEN | |||
| result := 3; | |||
| ELSIF(number >= 16 AND number < 32) THEN | |||
| result := 4; | |||
| ELSIF(number >= 32 AND number < 64) THEN | |||
| result := 5; | |||
| ELSIF(number >= 64 AND number < 128) THEN | |||
| result := 6; | |||
| ELSIF(number >= 128 AND number < 256) THEN | |||
| result := 7; | |||
| ELSIF(number >= 256 AND number < 512) THEN | |||
| result := 8; | |||
| ELSIF(number >= 512 AND number < 1024) THEN | |||
| result := 9; | |||
| ELSIF(number >= 1024 AND number < 2048) THEN | |||
| result := 10; | |||
| ELSIF(number >= 2048 AND number < 4096) THEN | |||
| Result := 11; | |||
| ELSIF(Number >= 4096 AND number < 8192) THEN | |||
| result := 12; | |||
| ELSIF(number >= 8192 AND number < 16384) THEN | |||
| result := 13; | |||
| ELSIF(number >= 16384 AND number < 32768) THEN | |||
| result := 14; | |||
| END IF; | |||
| RETURN result; | |||
| END FUNCTION; | |||
| END PACKAGE BODY used_functions_pkg; | |||