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rehayes |
////////////////////////////////////////////////////////////////////////////////
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//
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// Computer Operating Properly - XGATE interrupt encoder
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//
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// Author: Bob Hayes
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// rehayes@opencores.org
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//
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// Downloaded from: http://www.opencores.org/projects/xgate.....
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//
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////////////////////////////////////////////////////////////////////////////////
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// Copyright (c) 2009, Robert Hayes
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//
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// This source file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// by 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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// Supplemental terms.
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Neither the name of the <organization> nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY Robert Hayes ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL Robert Hayes BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 this program. If not, see <http://www.gnu.org/licenses/>.
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////////////////////////////////////////////////////////////////////////////////
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// 45678901234567890123456789012345678901234567890123456789012345678901234567890
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module xgate_irq_encode #(parameter MAX_CHANNEL = 127) // Max XGATE Interrupt Channel Number
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(
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output reg [ 6:0] int_req, // Encoded interrupt request
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input [MAX_CHANNEL:0] chan_req_i // XGATE Interrupt request
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);
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// Set int_reg to the index of the index of the highest chen_req_i input that is active
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integer i = 0;
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always @(chan_req_i)
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begin
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int_req = 0;
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for (i = 0; i <= MAX_CHANNEL; i = i + 1)
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if (chan_req_i[i] == 1'b1)
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int_req = i;
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end
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endmodule // xgate_irq_encode
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