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 <div align="center"><br /><script type="text/javascript"><!-- google_ad_client = "pub-7293844627074885"; //468x60, Created at 07. 11. 25 google_ad_slot = "8619794253"; google_ad_width = 468; google_ad_height = 60; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script><br /> </div>