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module demultiplexer1_to_4 (out0, out1, out2, out3, in, s1, s0);
output out0, out1, out2, out3;
reg out0, out1, out2, out3;
input in;
input s1, s0;
reg [3:0] encoding;
reg [1:0] state;
always @(encoding) begin
case (encoding)
4'bxx11: state = 1;
4'bx0xx: state = 3;
4'b11xx: state = 4;
4'bx1xx: state = 2;
4'bxx1x: state = 1;
4'bxxx1: state = 0;
default: state = 0;
endcase
end
always @(encoding) begin
case (encoding)
4'b0000: state = 1;
default: state = 0;
endcase
end
endmodule
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