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-- Programmable Interval Timer                                                --

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-- Simplest implementation of a programmable interval timer. The timer is     --

-- Wishbone compliant and functions on two instructions:                      --

--                                                                            --

--  o Start the timer with a Wb write. The data to be sent contains the       --

--    inverall length.                                                        --

--                                                                            --

--  o After the set limit is reached, the timer issues an interrupt and waits --

--    for a WB write. It returns back to initial state afterwards and waits   --

--    for a new WB write.                                                     --

--                                                                            --

-- The timer supports pulse timing only.                                      --

--                                                                            --

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-- Copyright (C)2011  Mathias Hörtnagl <mathias.hoertnagl@gmail.comt>         --

--                                                                            --

-- This program 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.                                        --

--                                                                            --

-- This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.      --

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library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

library work;

use work.iwb.all;

package ipit is

   component pit is

      port(

         si   : in  slave_in_t;

         so   : out slave_out_t;

      -- Non-Wishbone Signals

         intr : out std_logic

      );

   end component;

end ipit;