`include "positConfig.sv"
|
`include "positConfig.sv"
|
// ============================================================================
|
// ============================================================================
|
// __
|
// __
|
// \\__/ o\ (C) 2020 Robert Finch, Waterloo
|
// \\__/ o\ (C) 2020 Robert Finch, Waterloo
|
// \ __ / All rights reserved.
|
// \ __ / All rights reserved.
|
// \/_// robfinch@finitron.ca
|
// \/_// robfinch@finitron.ca
|
// ||
|
// ||
|
//
|
//
|
// positCntlz.sv
|
// positCntlz.sv
|
//
|
//
|
// This source file is free software: you can redistribute it and/or modify
|
// This source file is free software: you can redistribute it and/or modify
|
// it under the terms of the GNU Lesser General Public License as published
|
// it under the terms of the GNU Lesser General Public License as published
|
// by the Free Software Foundation, either version 3 of the License, or
|
// by the Free Software Foundation, either version 3 of the License, or
|
// (at your option) any later version.
|
// (at your option) any later version.
|
//
|
//
|
// This source file is distributed in the hope that it will be useful,
|
// This source file is distributed in the hope that it will be useful,
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
// GNU General Public License for more details.
|
// GNU General Public License for more details.
|
//
|
//
|
// You should have received a copy of the GNU General Public License
|
// You should have received a copy of the GNU General Public License
|
// along with this program. If not, see .
|
// along with this program. If not, see .
|
//
|
//
|
// ============================================================================
|
// ============================================================================
|
//
|
//
|
module positCntlz(i, o);
|
module positCntlz(i, o);
|
parameter PSTWID = `PSTWID;
|
parameter PSTWID = `PSTWID;
|
input [PSTWID-2:0] i;
|
input [PSTWID-2:0] i;
|
output [$clog2(PSTWID-2):0] o;
|
output [$clog2(PSTWID-1)-1:0] o;
|
|
|
generate begin : gClz
|
generate begin : gClz
|
case(PSTWID)
|
if (PSTWID <= 8)
|
16: cntlz16 u1 (.i({i,1'b1}), .o(o));
|
cntlz8 u1 (.i({i,{9-PSTWID{1'b1}}}), .o(o));
|
20: cntlz24 u1 (.i({i,1'b1,4'hF}), .o(o));
|
else if (PSTWID <= 16)
|
32: cntlz32 u1 (.i({i,1'b1}), .o(o));
|
cntlz16 u1 (.i({i,{17-PSTWID{1'b1}}}), .o(o));
|
40: cntlz48 u1 (.i({i,1'b1,8'hFF}), .o(o));
|
else if (PSTWID <= 24)
|
52: cntlz64 u1 (.i({i,1'b1,12'hFFF}), .o(o));
|
cntlz24 u1 (.i({i,{25-PSTWID{1'b1}}}), .o(o));
|
64: cntlz64 u1 (.i({i,1'b1}), .o(o));
|
else if (PSTWID <= 32)
|
80: cntlz80 u1 (.i({i,1'b1}), .o(o));
|
cntlz32 u1 (.i({i,{33-PSTWID{1'b1}}}), .o(o));
|
default: ;
|
else if (PSTWID <= 48)
|
endcase
|
cntlz48 u1 (.i({i,{49-PSTWID{1'b1}}}), .o(o));
|
|
else if (PSTWID <= 64)
|
|
cntlz64 u1 (.i({i,{65-PSTWID{1'b1}}}), .o(o));
|
|
else if (PSTWID <= 80)
|
|
cntlz80 u1 (.i({i,{81-PSTWID{1'b1}}}), .o(o));
|
|
else if (PSTWID <= 96)
|
|
cntlz96 u1 (.i({i,{97-PSTWID{1'b1}}}), .o(o));
|
|
else if (PSTWID <= 128)
|
|
cntlz128 u1 (.i({i,{129-PSTWID{1'b1}}}), .o(o));
|
end
|
end
|
endgenerate
|
endgenerate
|
|
|
endmodule
|
endmodule
|
|
|
