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--!
--! Copyright (C) 2011 - 2014 Creonic GmbH
--!
--! This file is part of the Creonic Viterbi Decoder, which is distributed
--! under the terms of the GNU General Public License version 2.
--!
--! @file
--! @brief Parameters
--! @author Markus Fehrenz
--! @date 2011/07/01
--!
--! @details This is the configuration file of the Viterbi decoder.
--! Any changes for parameters should be done here.
--! Changing parameters somewhere else may result in a malicious
--! behavior.
--!
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package pkg_param is
-----------------------------------
-- Convolutional Code Parameters --
-----------------------------------
--
-- Set the number of parity values
-- This has to correspond to PARITY_POLYNOMIALS
--
constant NUMBER_PARITY_BITS : natural := 2;
type t_parity is array (NUMBER_PARITY_BITS - 1 downto 0) of natural;
--
-- Set parity polynoms in decimal notation
-- NUMBER_PARITY_BITS has to correspond to the number of elements
-- Examples: WiFi : [121,91] or [121,91,101]
-- CDMA : [491,369] or [367,435,369] or [501,441,331,315]
-- GSM : [27,19] or [27,21,31]
-- DAB : [91,121,101,91]
-- WiMAX: [91,121,117]
--
constant PARITY_POLYNOMIALS : t_parity := (121,91);
--
-- Set a recursive polynomial
-- Set to 0 if no recursion is used
-- Setting this arbitrary may result in a worse error correction ability
--
constant FEEDBACK_POLYNOMIAL : natural := 0;
-----------------------------
-- Architecture Parameters --
-----------------------------
--
-- Set bit width of LLR input
-- Recommended values: 3 or 4
--
constant BW_LLR_INPUT : natural := 4;
--
-- Set the maximum window length which shall be allowed at runtime.
-- Recommended: at least 6 * constraint length
--
constant MAX_WINDOW_LENGTH : natural := 96;
--
-- Set to 'true' if distributed RAM shall be used
-- Set to 'false' if block RAM shall be used
--
constant DISTRIBUTED_RAM : boolean := true;
end package pkg_param;
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