how to declare dynamic port size depending on generic

Instead of defining FRAME_SIZE, define FRAME_WIDTH, then later inside your architecture define

constant FRAME_SIZE : integer := 2**FRAME_WIDTH-1;

Or, have two generics, FRAME_SIZE and FRAME_WIDTH, and where ever you instantiate the component have code in that architecture that defines

library ieee;

use ieee.math_real; -- ceil and log2

....

constant FRAME_SIZE : integer := 64;

constant FRAME_WIDTH : integer := integer(ceil(log2(real(FRAME_SIZE))));

....

u1: tone_det

generic map (

FRAME_SIZE => FRAME_SIZE,

FRAME_WIDTH => FRAME_WIDTH

);

port map (

...

Cheers,

Dave