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55 lines
1.9 KiB
Systemverilog
55 lines
1.9 KiB
Systemverilog
///////////////////////////////////////////
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// counter.sv
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//
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// Written: Ross Thompson
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// Modified:
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//
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// Purpose: basic up counter
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
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// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
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// 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 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 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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///////////////////////////////////////////
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`include "wally-config.vh"
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module SDCcounter #(parameter integer WIDTH=32)
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(
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input logic [WIDTH-1:0] CountIn,
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output logic [WIDTH-1:0] CountOut,
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input logic Load,
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input logic Enable,
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input logic clk,
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input logic reset);
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logic [WIDTH-1:0] NextCount;
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logic [WIDTH-1:0] count_q;
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logic [WIDTH-1:0] CountP1;
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flopenr #(WIDTH) reg1(.clk,
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.reset,
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.en(Enable | Load),
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.d(NextCount),
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.q(CountOut));
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assign CountP1 = CountOut + 1'b1;
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// mux between load and P1
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assign NextCount = Load ? CountIn : CountP1;
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endmodule
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