source: HDLQ/Library/Fanoutbi4.v @ 1

module Fanout_bi4 (A, B, C, status, fault);
//   A
//   |- C
//   B
//forward =1 information goes A-> B D->E
//status 00=relax,01=switch, 10=hold, 11=release
// if fault =1 the out is inverted if in the "L shaped " path
        input [1:0] status;
        input fault;
        inout A,B,C;
        reg loadedA,loadedB,loadedC;
        wor A,B,C,D,E,F;
        
assign D = A;
assign D = C;
assign E = A;
assign E = B;
assign F = C;
assign F = B;

assign B =  (status == 2'b10) ? loadedB :
            (status == 2'b01) ? (fault ? (A===1'bz  ?  ~D : D)  :D)  : 1'bz;
assign A =  (status == 2'b10) ? loadedA :
            (status == 2'b01) ? (fault ? (B===1'bz ?  ~F : F)  :F)  : 1'bz;
assign C =  (status == 2'b10) ? loadedC :
            (status == 2'b01) ? (fault ? ~E : E)  : 1'bz;

            
initial
begin
        loadedA <=1'bz;
        loadedB <=1'bz;
        loadedC <=1'bz;
end

always @ (posedge status[1])

                        begin
                                loadedA <= (A===1'bx)? 1'bz: A;
                                loadedB <= (B===1'bx)? 1'bz: B;
                                loadedC <= (C===1'bx)? 1'bz: C;
                        end

always@(posedge status[0])
        begin
                loadedA <= 1'bz;
                loadedB <= 1'bz;
                loadedC <= 1'bz;
        end     

endmodule