// *************************************************************************** // *************************************************************************** // Copyright 2014(c) Analog Devices, Inc. // // All rights reserved. // // Redistribution and use in source and binary forms, with or without modification, // are permitted provided that the following conditions are met: // - Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // - 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. // - Neither the name of Analog Devices, Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // - The use of this software may or may not infringe the patent rights // of one or more patent holders. This license does not release you // from the requirement that you obtain separate licenses from these // patent holders to use this software. // - Use of the software either in source or binary form, must be run // on or directly connected to an Analog Devices Inc. component. // // THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, // INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A // PARTICULAR PURPOSE ARE DISCLAIMED. // // IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY // RIGHTS, 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. // *************************************************************************** // *************************************************************************** // Divides the input clock to SEL_0_DIV if clk_sel is 0 or SEL_1_DIV if // clk_sel is 1. Provides a glitch free output clock // IP uses BUFR/BUFGCE_DIV and BUFGMUX_CTRL primitives // *************************************************************************** // *************************************************************************** `timescale 1ns/100ps module util_clkdiv_alt #( parameter SIM_DEVICE = "CYCLONE5", parameter CLOCK_TYPE = "Global Clock") ( input clk, input reset, output clk_out, output reset_out ); reg enable; reg reset_d1; assign reset_out = reset | reset_d1; always @(posedge clk) begin reset_d1 <= reset; end always @(posedge clk) begin enable <= ~enable; end generate if (SIM_DEVICE == "CYCLONE5") begin cyclonev_clkena #( .clock_type ("Global Clock"), .ena_register_mode ("falling edge"), .lpm_type ("cyclonev_clkena") ) clock_divider_by_2 ( .ena(enable), .enaout(), .inclk(clk), // .clkselect (2'b0), .outclk(clk_out)); end endgenerate endmodule // util_clkdiv_alt