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36 lines
1.1 KiB
Systemverilog
36 lines
1.1 KiB
Systemverilog
// Copyright Jamie Iles, 2017
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//
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// This file is part of s80x86.
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//
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// s80x86 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// s80x86 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with s80x86. If not, see <http://www.gnu.org/licenses/>.
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`default_nettype none
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module LoopCounter(input logic clk,
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input logic [4:0] count_in,
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input logic load,
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input logic next,
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output logic done);
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reg [4:0] count;
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assign done = ~|count;
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always_ff @(posedge clk)
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if (load)
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count <= count_in;
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else if (next && |count)
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count <= count - 1'b1;
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endmodule
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