Subversion Repositories scarts

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

-- This file is part of SCARTS.

-- 

-- SCARTS is free software: you can redistribute it and/or modify

-- it under the terms of the GNU General Public License as published by

-- the Free Software Foundation, either version 3 of the License, or

-- (at your option) any later version.

-- 

-- SCARTS is distributed in the hope that it will be useful,

-- but WITHOUT ANY WARRANTY; without even the implied warranty of

-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-- GNU General Public License for more details.

-- 

-- You should have received a copy of the GNU General Public License

-- along with SCARTS.  If not, see <http://www.gnu.org/licenses/>.

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

library ieee;

use ieee.std_logic_1164.all;

use work.math_pkg.all;

entity key_matrix is

  generic

  (

    CLK_FREQ           : integer range 1 to integer'high;

    SCAN_TIME_INTERVAL : time range 1 ms to 100 ms;

    DEBOUNCE_TIMEOUT   : time range 100 us to 1 ms;

    SYNC_STAGES        : integer range 2 to integer'high;

    COLUMN_COUNT       : integer range 1 to integer'high;

    ROW_COUNT          : integer range 1 to integer'high

  );

  port

  (

    sys_clk   : in  std_logic;

    sys_res_n : in  std_logic;

    columns   : out std_logic_vector(COLUMN_COUNT - 1 downto 0);

    rows      : in  std_logic_vector(ROW_COUNT - 1 downto 0);

    key       : out std_logic_vector(log2c(ROW_COUNT * COLUMN_COUNT) - 1 downto 0)

  );

end entity key_matrix;