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+
+-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs 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 2 of the License, or (at
+-- your option) any later version.
+
+-- VESTs 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 VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+-- ---------------------------------------------------------------------
+--
+-- $Id: ch_04_fg_04_03.vhd,v 1.2 2001-10-26 16:29:33 paw Exp $
+-- $Revision: 1.2 $
+--
+-- ---------------------------------------------------------------------
+
+entity fg_04_03 is
+
+end entity fg_04_03;
+
+
+----------------------------------------------------------------
+
+
+architecture test of fg_04_03 is
+begin
+
+ -- code from book:
+
+ modem_controller : process is
+
+ type symbol is ('a', 't', 'd', 'h', digit, cr, other);
+ type symbol_string is array (1 to 20) of symbol;
+ type state is range 0 to 6;
+ type transition_matrix is array (state, symbol) of state;
+
+ constant next_state : transition_matrix :=
+ ( 0 => ('a' => 1, others => 6),
+ 1 => ('t' => 2, others => 6),
+ 2 => ('d' => 3, 'h' => 5, others => 6),
+ 3 => (digit => 4, others => 6),
+ 4 => (digit => 4, cr => 0, others => 6),
+ 5 => (cr => 0, others => 6),
+ 6 => (cr => 0, others => 6) );
+
+ variable command : symbol_string;
+ variable current_state : state := 0;
+
+ -- not in book:
+ type sample_array is array (positive range <>) of symbol_string;
+ constant sample_command : sample_array :=
+ ( 1 => ( 'a', 't', 'd', digit, digit, cr, others => other ),
+ 2 => ( 'a', 't', 'h', cr, others => other ),
+ 3 => ( 'a', 't', other, other, cr, others => other ) );
+ -- end not in book
+
+ begin
+ -- . . .
+ -- not in book:
+ for command_index in sample_command'range loop
+ command := sample_command(command_index);
+ -- end not in book
+ for index in 1 to 20 loop
+ current_state := next_state( current_state, command(index) );
+ case current_state is
+ -- . . .
+ -- not in book:
+ when 0 => exit;
+ when others => null;
+ -- end not in book
+ end case;
+ end loop;
+ -- . . .
+ -- not in book:
+ end loop;
+ wait;
+ -- end not in book
+ end process modem_controller;
+
+ -- end of code from book
+
+end architecture test;