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[/] [mkjpeg/] [tags/] [REL_53/] [trunk/] [design/] [common/] [JPEG_PKG.vhd] - Rev 32
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-------------------------------------------------------------------------------- -- -- -- V H D L F I L E -- -- COPYRIGHT (C) 2009 -- -- -- -------------------------------------------------------------------------------- -- -- Title : JPEG_PKG -- Design : JPEG_ENC -- Author : Michal Krepa -- -------------------------------------------------------------------------------- -- -- File : JPEG_PKG.VHD -- Created : Sat Mar 7 2009 -- -------------------------------------------------------------------------------- -- -- Description : Package for JPEG core -- -------------------------------------------------------------------------------- library IEEE; use IEEE.STD_LOGIC_1164.all; use ieee.numeric_std.all; package JPEG_PKG is -- do not change, constant constant C_HDR_SIZE : integer := 407; -- warning! this parameter heavily affects memory size required -- if expected image width is known change this parameter to match this -- otherwise some onchip RAM will be wasted and never used constant C_MAX_LINE_WIDTH : integer := 640; -- 0=highest clock per pixel performance -- 1=memory used by BUF_FIFO halved, speed performance reduced by circa 18% constant C_MEMORY_OPTIMIZED : integer := 1; type T_SM_SETTINGS is record x_cnt : unsigned(15 downto 0); y_cnt : unsigned(15 downto 0); cmp_idx : unsigned(1 downto 0); end record; constant C_SM_SETTINGS : T_SM_SETTINGS := ( (others => '0'), (others => '0'), (others => '0') ); function log2(n : natural) return natural; end package JPEG_PKG; package body JPEG_PKG is ----------------------------------------------------------------------------- function log2(n : natural) return natural is begin for i in 0 to 31 loop if (2**i) >= n then return i; end if; end loop; return 32; end log2; ----------------------------------------------------------------------------- end package body JPEG_PKG;
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