module traffic(clk,en,lampa,lampb,acount,bcount);output[7:0] acount,bcount;output[3:0] lampa,lampb;   //?????????????input clk,en;reg[7:0] numa,numb;reg tempa,tempb;reg[2:0] counta,countb;reg[7:0] ared,ayellow,agreen,aleft,bred,byellow,bgreen,bleft;reg[3:0] lampa,lampb;always @(en)   if(!en)   begin     ared     <=8'd55;            ayellow  <=8'd5;            agreen   <=8'd40;            aleft    <=8'd15;                bred     <=8'd65;           byellow  <=8'd5;             bleft    <=8'd15;            bgreen   <=8'd30;          end   assign acount=numa; assign bcount=numb;  always @(posedge clk)    begin      if(en)      begin          if(!tempa)            begin            tempa<=1;            case(counta)            0: begin                numa<=agreen;                lampa<=2;       //lampa?0010               counta<=1;               end                       1: begin                numa<=ayellow;                lampa<=4;       //lampa?0100               counta<=2;               end                         2: begin                numa<=aleft;                lampa<=1;       //lampa?0001               counta<=3;               end                             3: begin                numa<=ayellow;                lampa<=4;       //lampa?0100                 counta<=4;               end                          4: begin                numa<=ared;                lampa<=8;       //lampa?1000               counta<=0;               end             default:   lampa<=8;            endcase            end           else begin                          if(numa>1)                   if(numa[3:0]==0)                      begin                      numa[3:0]<=4'b1001;                      numa[7:4]<=numa[7:4]-1;                      end                   else numa[3:0]<=numa[3:0]-1;                                      if(numa==2)                     tempa<=0;                end      end       else begin                    //en?????counta,tempa????lampa????           lampa<=4'b1000;           counta<=0;tempa<=0;           end    end         always @(posedge clk)    begin      if(en)      begin          if(!tempb)            begin            tempb<=1;            case(countb)            0: begin                numb<=bgreen;                lampb<=8;               countb<=1;               end                       1: begin                numb<=byellow;                lampb<=2;               countb<=2;               end                         2: begin                numb<=bleft;                lampb<=4;               countb<=3;               end                             3: begin                numb<=byellow;                lampb<=1;               countb<=4;               end                          4: begin                numb<=bred;                lampb<=4;               countb<=0;               end             default:   lampb<=8;            endcase            end           else begin                           if(numb>1)                   if(numb[3:0]==0)                      begin                      numb[3:0]<=4'b1001;                      numb[7:4]<=numb[7:4]-1;                      end                   else numb[3:0]<=numb[3:0]-1;                                      if(numb==2)                     tempb<=0;                end      end       else begin           lampb<=4'b1000;           countb<=0;tempb<=0;           end    end   endmodule