-------------------------------------------------------------------------------
-- Copyright (c) 2003 Mentor Graphics Corporation
--
-- This model is a component of the Mentor Graphics VHDL-AMS educational open 
-- source model library, and is covered by this license agreement. This model,
-- including any updates, modifications, revisions, copies, and documentation 
-- are copyrighted works of Mentor Graphics. USE OF THIS MODEL INDICATES YOUR 
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-- THIS MODEL IS LICENSED TO YOU "AS IS" AND WITH NO WARRANTIES, EXPRESS OR 
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-------------------------------------------------------------------------------
-- File       : q_Limit.vhd
-- Author     : Mentor Graphics
-- Created    : 2003/03/26
-- Last update: 2003-05-20
-------------------------------------------------------------------------------
-- Description: Limiter with real quantity connections. Limits have a small
-- slope whose default value is 1.0e-4. Includes s-domain architecture.
-------------------------------------------------------------------------------
-- Revisions  :
-- Date        Version     Author              Description
-- 2003/03/26  1.0         Mentor Graphics     Created    
-------------------------------------------------------------------------------

library IEEE;
use ieee.math_real.all;

entity q_Limit is
  generic (
    limit_high :     real := 5.0;    -- upper limit
    limit_low  :     real := -5.0);  -- lower limit
  port (
    quantity input  : in  real;
    quantity output : out real);
end entity q_Limit;

architecture simple of q_Limit is
  constant slope : real := 1.0e-4;
begin
  if input'above(limit_high) use       -- High limit exceeded, limit input
    output == limit_high + slope*(input - limit_high);
  elsif not input'above(limit_low) use -- Low limit exceeded, limit input
    output   == limit_low + slope*(input - limit_low);
  else                                 -- No limit exceeded, pass input
    output   == input;
  end use;
  break on input'above(limit_high), input'above(limit_low);
end architecture simple;

-------------------------------------------------------------------------------
-- Copyright (c) 2003 Mentor Graphics Corporation
-------------------------------------------------------------------------------