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pos2bin.sv
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pos2bin.sv
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//------------------------------------------------------------------------------
// pos2bin.sv
// Konstantin Pavlov, pavlovconst@gmail.com
//------------------------------------------------------------------------------
// INFO ------------------------------------------------------------------------
// Converts positional (one-hot) value to binary representation
// Thus 4'b0001 becomes 2'd0 and 256'b10100000 becomes 8'd5
// Module is being synthesized into combinational logic only
// See also bin2pos.sv module for inverse transformation
/* --- INSTANTIATION TEMPLATE BEGIN ---
pos2bin #(
.BIN_WIDTH( 8 )
) PB1 (
.pos( ),
.bin( ),
.err_no_hot( ),
.err_multi_hot( )
);
--- INSTANTIATION TEMPLATE END ---*/
module pos2bin #( parameter
BIN_WIDTH = 8,
POS_WIDTH = 2**BIN_WIDTH
)(
input [(POS_WIDTH-1):0] pos,
output logic [(BIN_WIDTH-1):0] bin,
// error flags
output logic err_no_hot, // no active bits in pos[] vector
output logic err_multi_hot // multiple active bits in pos[] vector
// only least-sensitive active bit affects the output
);
assign err_no_hot = (pos[(POS_WIDTH-1):0] == 0);
integer i;
logic found_hot;
always_comb begin
err_multi_hot = 0;
bin[(BIN_WIDTH-1):0] = 0;
found_hot = 0;
for (i=0; i<POS_WIDTH; i++) begin
if ( ~found_hot && pos[i] ) begin
bin[(BIN_WIDTH-1):0] = i[(BIN_WIDTH-1):0];
end
if ( found_hot && pos[i] ) begin
err_multi_hot=1'b1;
end
if ( pos[i] ) begin
found_hot = 1'b1;
end
end // for
end // always_comb
endmodule