-------------------------------------------------------------------------------
-- Title      : Package: Uniquifier Signal Types
-- Project    : Prototype implementation of the GTU of the Alice TRD Experiment
-------------------------------------------------------------------------------
-- File       : track_types.vhd
-- Author     : Jan de Cuveland  <cuveland@kip.uni-heidelberg.de>
-- Company    : 
-- Last update: 2003/06/16
-- Platform   : 
-------------------------------------------------------------------------------
-- This is a prototype implementation of the Global Tracking Unit (GTU)
-- of the Alice TRD detector.
-------------------------------------------------------------------------------
-- Description: 
-------------------------------------------------------------------------------
-- Revisions  :
-- Date        Version  Author  Description
-- 2003/06/16  1.0      cuveland        Created
-------------------------------------------------------------------------------

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use work.gtu_types.all;

-------------------------------------------------------------------------------

package track_types is

  -- constants and signal types for tracks
  constant zhalf_width : integer := zpos_width - 1;

  constant track_with_idx_width   : integer :=
    idx_width + approx_ypos_width + 6 * addr_width + 6;
  constant track_with_zpos_width  : integer :=
    zpos_width + approx_ypos_width + 6 * addr_width + 6;
  constant track_with_zhalf_width : integer :=
    zhalf_width + approx_ypos_width + 6 * addr_width + 6;
  constant track_width            : integer :=
    6 * addr_width + 6;

  subtype track_with_idx_t is
    std_logic_vector (track_with_idx_width-1 downto 0);
  subtype track_with_zpos_t is
    std_logic_vector (track_with_zpos_width-1 downto 0);
  subtype track_with_zhalf_t is
    std_logic_vector (track_with_zhalf_width-1 downto 0);
  subtype track_t is
    std_logic_vector (track_width-1 downto 0);

  constant matchvec_low  : integer := 0;
  constant matchvec_high : integer := matchvec_low + 6 - 1;
  constant addr0_low     : integer := matchvec_high + 1;
  constant addr0_high    : integer := addr0_low + addr_width - 1;
  constant y_low         : integer := addr0_high + 5 * addr_width + 1;
  constant y_high        : integer := y_low + approx_ypos_width - 1;
  constant idx_low       : integer := y_high + 1;
  constant idx_high      : integer := idx_low + idx_width - 1;
  constant zpos_low      : integer := y_high + 1;
  constant zpos_high     : integer := idx_low + zpos_width - 1;
  constant zhalf_low     : integer := y_high + 1;
  constant zhalf_high    : integer := idx_low + zhalf_width - 1;
  
end track_types;