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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 receiver is
+end entity receiver;
+
+
+-- code from book
+
+architecture behavioral of receiver is
+
+ -- . . . -- type declarations, etc
+
+ -- not in book
+
+ subtype packet_index_range is integer range 1 to 8;
+ type packet_array is array (packet_index_range) of bit;
+
+ -- end not in book
+
+ signal recovered_data : bit;
+ signal recovered_clock : bit;
+ -- . . .
+
+ procedure receive_packet ( signal rx_data : in bit;
+ signal rx_clock : in bit;
+ data_buffer : out packet_array ) is
+ begin
+ for index in packet_index_range loop
+ wait until rx_clock = '1';
+ data_buffer(index) := rx_data;
+ end loop;
+ end procedure receive_packet;
+
+begin
+
+ packet_assembler : process is
+ variable packet : packet_array;
+ begin
+ -- . . .
+ receive_packet ( recovered_data, recovered_clock, packet );
+ -- . . .
+ end process packet_assembler;
+
+ -- . . .
+
+
+ -- not in book
+
+ data_generator : recovered_data <= '1' after 5 ns,
+ '0' after 15 ns,
+ '1' after 25 ns,
+ '0' after 35 ns,
+ '0' after 45 ns,
+ '1' after 55 ns,
+ '0' after 65 ns,
+ '1' after 75 ns;
+
+ clock_generator : process is
+ begin
+ recovered_clock <= '0' after 2 ns, '1' after 10 ns;
+ wait for 10 ns;
+ end process clock_generator;
+
+ -- end not in book
+
+end architecture behavioral;
+
+-- end code from book