| //---------------------------------------------------------------------------- |
| // Copyright (C) 2009 , Olivier Girard |
| // |
| // 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 the authors 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 HOLDER 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 |
| // |
| //---------------------------------------------------------------------------- |
| // |
| // *File Name: omsp_sync_reset.v |
| // |
| // *Module Description: |
| // Generic reset synchronizer for the openMSP430 |
| // |
| // *Author(s): |
| // - Olivier Girard, olgirard@gmail.com |
| // |
| //---------------------------------------------------------------------------- |
| // $Rev: 103 $ |
| // $LastChangedBy: olivier.girard $ |
| // $LastChangedDate: 2011-03-05 15:44:48 +0100 (Sat, 05 Mar 2011) $ |
| //---------------------------------------------------------------------------- |
| |
| module omsp_sync_reset ( |
| |
| // OUTPUTs |
| rst_s, // Synchronized reset |
| |
| // INPUTs |
| clk, // Receiving clock |
| rst_a // Asynchronous reset |
| ); |
| |
| // OUTPUTs |
| //========= |
| output rst_s; // Synchronized reset |
| |
| // INPUTs |
| //========= |
| input clk; // Receiving clock |
| input rst_a; // Asynchronous reset |
| |
| |
| //============================================================================= |
| // 1) SYNCHRONIZER |
| //============================================================================= |
| |
| reg [1:0] data_sync; |
| |
| always @(posedge clk or posedge rst_a) |
| if (rst_a) data_sync <= 2'b11; |
| else data_sync <= {data_sync[0], 1'b0}; |
| |
| assign rst_s = data_sync[1]; |
| |
| |
| endmodule // omsp_sync_reset |
| |
