Generic parameter with variable size

[Altera_Forum]

Hi all 

 My design requires a parameter defined at compilation time that can range from 1 to 128 bytes. It isn't possible to create a generic based on another generic like this:  generic (  es_size : natural range 1 to 128 := 2;   es_info : bidim_array_t(es_size-1 downto 0) := (x"00",x"00")); )  Where bidim_array_t is defined inside a package: type bidim_array_t is array(natural range <>) of std_logic_vector(7 downto 0);  With this code Quartus reports the following error: ***generic "es_size" cannot be used in its own interface list***  Removing the es_size and fixating the size of es_info to 128 could be one solution but I would like to know if there is anything more elegant to do in this case.  Thank you Best regards Thiago

[Altera_Forum]

--- Quote Start ---  Hi all  My design requires a parameter defined at compilation time that can range from 1 to 128 bytes. It isn't possible to create a generic based on another generic like this:  generic (  es_size : natural range 1 to 128 := 2;   es_info : bidim_array_t(es_size-1 downto 0) := (x"00",x"00")); )  Where bidim_array_t is defined inside a package: type bidim_array_t is array(natural range <>) of std_logic_vector(7 downto 0);  With this code Quartus reports the following error: ***generic "es_size" cannot be used in its own interface list***  Removing the es_size and fixating the size of es_info to 128 could be one solution but I would like to know if there is anything more elegant to do in this case.  Thank you Best regards Thiago  --- Quote End ---    I think generic should be a constant so that compiler knows what to do. Your second declaration of bidim_array should be an input