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da6856befa
- Needed for some logic with feedback, otherwise you get "x" loop - Those who don't need it should be able to connect nrest to 1'b1
65 lines
3.1 KiB
Verilog
65 lines
3.1 KiB
Verilog
//#############################################################################
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//# Function: Converts an edge to a single cycle pulse #
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//#############################################################################
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//# Author: Andreas Olofsson #
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//# License: MIT (see below) #
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//#############################################################################
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module oh_edge2pulse(/*AUTOARG*/
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// Outputs
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out,
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// Inputs
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clk, nreset, in
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);
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//########################################
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//# INTERFACE
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//########################################
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parameter DW = 1; // width of data inputs
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input clk; // clock
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input nreset; // async active low reset
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input [DW-1:0] in; // edge input
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output [DW-1:0] out; // one cycle pulse
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//########################################
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//# BODY
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//########################################
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reg [DW-1:0] in_reg;
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always @ (posedge clk or negedge nreset)
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if(!nreset)
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in_reg[DW-1:0] <= 'b0 ;
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else
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in_reg[DW-1:0] <= in[DW-1:0] ;
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assign out[DW-1:0] = in_reg[DW-1:0] ^ in[DW-1:0] ;
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endmodule // oh_edge2pulse
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//////////////////////////////////////////////////////////////////////////////
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// The MIT License (MIT) //
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// //
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// Copyright (c) 2015-2016, Adapteva, Inc. //
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// //
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// Permission is hereby granted, free of charge, to any person obtaining a //
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// copy of this software and associated documentation files (the "Software")//
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// to deal in the Software without restriction, including without limitation//
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// the rights to use, copy, modify, merge, publish, distribute, sublicense, //
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// and/or sell copies of the Software, and to permit persons to whom the //
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// Software is furnished to do so, subject to the following conditions: //
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// //
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// The above copyright notice and this permission notice shall be included //
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// in all copies or substantial portions of the Software. //
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// //
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS //
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF //
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. //
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY //
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT//
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// OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR //
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// THE USE OR OTHER DEALINGS IN THE SOFTWARE. //
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// //
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//////////////////////////////////////////////////////////////////////////////
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