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LUT3.v
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LUT3.v
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`timescale 1 ps / 1 ps
module LUT3 (O, I0, I1, I2);
parameter INIT = 8'h00;
input I0, I1, I2;
output O;
reg O;
reg tmp;
always @( I2 or I1 or I0 ) begin
tmp = I0 ^ I1 ^ I2;
if ( tmp == 0 || tmp == 1)
O = INIT[{I2, I1, I0}];
else
O = lut3_mux4 ( {1'b0, 1'b0, lut3_mux4 (INIT[7:4], {I1, I0}),
lut3_mux4 (INIT[3:0], {I1, I0}) }, {1'b0, I2});
end
function lut3_mux4;
input [3:0] d;
input [1:0] s;
begin
if ((s[1]^s[0] ==1) || (s[1]^s[0] ==0))
lut3_mux4 = d[s];
else if ((d[0] === d[1]) && (d[2] === d[3]) && (d[0] === d[2]))
lut3_mux4 = d[0];
else if ((s[1] == 0) && (d[0] === d[1]))
lut3_mux4 = d[0];
else if ((s[1] == 1) && (d[2] === d[3]))
lut3_mux4 = d[2];
else if ((s[0] == 0) && (d[0] === d[2]))
lut3_mux4 = d[0];
else if ((s[0] == 1) && (d[1] === d[3]))
lut3_mux4 = d[1];
else
lut3_mux4 = 1'bx;
end
endfunction
endmodule