41 lines
969 B
Coq
41 lines
969 B
Coq
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/*
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* Copyright (C) 2020-2022 F4PGA Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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module top (
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input CLK,
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output [3:0] LEDs
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);
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localparam BITS = 4;
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localparam LOG2DELAY = 22;
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wire bufg;
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BUFG bufgctrl (
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.I(CLK),
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.O(bufg)
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);
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reg [BITS+LOG2DELAY-1:0] counter = 0;
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always @(posedge bufg) begin
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counter <= counter + 1;
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end
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assign LEDs[3:0] = counter >> LOG2DELAY;
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endmodule
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