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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
+
+package physical_attributes is
+
+ -- code from book (in text)
+
+ attribute layout_ignore : boolean;
+ attribute pin_number : positive;
+
+ -- end code from book
+
+end package physical_attributes;
+
+
+-- code from book
+
+library ieee; use ieee.std_logic_1164.all;
+use work.physical_attributes.all;
+
+entity \74x138\ is
+ generic ( Tpd : time );
+ port ( en1, en2a_n, en2b_n : in std_logic;
+ s0, s1, s2 : in std_logic;
+ y0, y1, y2, y3, y4, y5, y6, y7 : out std_logic );
+
+ attribute layout_ignore of Tpd : constant is true;
+
+ attribute pin_number of s0 : signal is 1;
+ attribute pin_number of s1 : signal is 2;
+ attribute pin_number of s2 : signal is 3;
+ attribute pin_number of en2a_n : signal is 4;
+ -- . . .
+
+end entity \74x138\;
+
+-- code from book