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Diffstat (limited to 'tests/openmsp430/rtl/omsp_sync_reset.v')
| -rw-r--r-- | tests/openmsp430/rtl/omsp_sync_reset.v | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/tests/openmsp430/rtl/omsp_sync_reset.v b/tests/openmsp430/rtl/omsp_sync_reset.v new file mode 100644 index 000000000..15a158b43 --- /dev/null +++ b/tests/openmsp430/rtl/omsp_sync_reset.v @@ -0,0 +1,78 @@ +//---------------------------------------------------------------------------- +// 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 + |