/**************************************************************************** * Copyright (c) 2011 by Michael Fischer. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the author nor the names of its contributors may * be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ***************************************************************************** * History: * * 06.11.2011 mifi First Version, for the Nios II tutorial. * The tutorial can be find here: * http://www.emb4fun.de ****************************************************************************/ /* * The simple_counter based on the example from the DE0-Nano User Manual */ /*=========================================================================*/ /* DEFINE: The module */ /*=========================================================================*/ module simple_counter ( clock, counter_out ); /*=========================================================================*/ /* DEFINE: Input / Output */ /*=========================================================================*/ input clock; output counter_out; /*=========================================================================*/ /* DEFINE: Definition of all local variables */ /*=========================================================================*/ reg [31:0] counter_data; /*=========================================================================*/ /* DEFINE: All HDL code */ /*=========================================================================*/ always @ (posedge clock) begin counter_data <= counter_data + 1; end assign counter_out = counter_data[21]; endmodule /*** EOF ***/