library widget_cells, wasp_lib; architecture cell_based of filter is -- declaration of signals, etc -- . . . -- not in book signal clk, filter_clk, accum_en, carry : bit; signal sum, alu_op1, alu_op2, result : bit_vector(31 downto 0); -- end not in book begin clk_pad : entity wasp_lib.in_pad port map ( i => clk, z => filter_clk ); accum : entity widget_cells.reg32 port map ( en => accum_en, clk => filter_clk, d => sum, q => result ); alu : entity work.adder port map ( a => alu_op1, b => alu_op2, y => sum, c => carry ); -- other component instantiations -- . . . end architecture cell_based; <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>