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+
+-- Copyright (C) 2002 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
+
+entity processor is
+end entity processor;
+
+
+
+-- code from book
+
+architecture rtl of processor is
+
+ subtype word is bit_vector(0 to 31);
+ type word_vector is array (natural range <>) of word;
+
+ function resolve_unique ( drivers : word_vector ) return word is
+ begin
+ return drivers(drivers'left);
+ end function resolve_unique;
+
+ signal source1, source2 : resolve_unique word register;
+ -- . . .
+
+ -- not in book
+
+ type alu_op_type is (pass1, pass2, add, subtract);
+
+ procedure perform_alu_op ( signal alu_opcode : in alu_op_type;
+ signal source1, source2 : in word;
+ signal destination : out word;
+ constant ignored : in integer := 0 ) is
+ begin
+ null;
+ end procedure perform_alu_op;
+
+ signal phase1, source1_reg_out_en,other_signal : bit;
+ signal alu_opcode : alu_op_type;
+ signal destination : word;
+
+ -- end not in book
+
+begin
+
+ source1_reg : process (phase1, source1_reg_out_en, -- . . .) is
+ -- not in book
+ other_signal) is
+ -- end not in book
+ variable stored_value : word;
+ begin
+ -- . . .
+ if source1_reg_out_en = '1' and phase1 = '1' then
+ source1 <= stored_value;
+ -- not in book
+ stored_value := not stored_value;
+ -- end not in book
+ else
+ source1 <= null;
+ end if;
+ end process source1_reg;
+
+ alu : perform_alu_op ( alu_opcode, source1, source2, destination, -- . . . );
+ -- not in book
+ open );
+ -- end not in book
+
+ -- . . .
+
+ -- not in book
+
+ process is
+ begin
+ wait for 10 ns;
+ source1_reg_out_en <= '1';
+ phase1 <= '1', '0' after 10 ns;
+ wait for 20 ns;
+ source1_reg_out_en <= '1';
+ phase1 <= '1', '0' after 10 ns;
+ wait;
+ end process;
+
+ -- end not in book
+
+end architecture rtl;
+
+-- end code from book