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48 lines
1.3 KiB
Verilog
48 lines
1.3 KiB
Verilog
/* This file is part of JTOPL.
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JTOPL 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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JTOPL 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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You should have received a copy of the GNU General Public License
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along with JTOPL. If not, see <http://www.gnu.org/licenses/>.
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Author: Jose Tejada Gomez. Twitter: @topapate
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Version: 1.0
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Date: 21-6-2020
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*/
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// Based on Nuked's work on OPLL and OPL3
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module jtopl_pm (
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input [ 2:0] vib_cnt,
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input [ 9:0] fnum,
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input vib_dep,
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input viben,
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output reg [ 3:0] pm_offset
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);
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reg [2:0] range;
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always @(*) begin
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if( vib_cnt[1:0]==2'b00 )
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range = 3'd0;
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else begin
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range = fnum[9:7]>>vib_cnt[0];
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if(!vib_dep) range = range>>1;
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end
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if( vib_cnt[2] )
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pm_offset = ~{1'b0, range } + 4'd1;
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else
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pm_offset = {1'b0, range };
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if(!viben) pm_offset = 4'd0;
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end
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endmodule
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