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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_07_fg_07_02.vhd,v 1.2 2001-10-26 16:29:34 paw Exp $
+-- $Revision: 1.2 $
+--
+-- ---------------------------------------------------------------------
+
+-- not in book
+
+entity control_processor is
+ generic ( Tpd : delay_length := 3 ns );
+end entity control_processor;
+
+-- end not in book
+
+
+
+architecture rtl of control_processor is
+
+ type func_code is (add, subtract);
+
+ signal op1, op2, dest : integer;
+ signal Z_flag : boolean;
+ signal func : func_code;
+ -- . . .
+
+begin
+
+ alu : process is
+
+ procedure do_arith_op is
+ variable result : integer;
+ begin
+ case func is
+ when add =>
+ result := op1 + op2;
+ when subtract =>
+ result := op1 - op2;
+ end case;
+ dest <= result after Tpd;
+ Z_flag <= result = 0 after Tpd;
+ end procedure do_arith_op;
+
+ begin
+ -- . . .
+ do_arith_op;
+ -- . . .
+ -- not in book
+ wait on op1, op2, func;
+ -- end not in book
+ end process alu;
+
+ -- . . .
+
+ -- not in book
+
+ stimulus : process is
+ begin
+ op1 <= 0; op2 <= 0; wait for 10 ns;
+ op1 <= 10; op2 <= 3; wait for 10 ns;
+ func <= subtract; wait for 10 ns;
+ op2 <= 10; wait for 10 ns;
+
+ wait;
+ end process stimulus;
+
+ -- end not in book
+
+end architecture rtl;