module moKcounter(//input                                                                clk,se,K,reset,                                                       //output                                                               carry,borrow);                         input se,clk,reset;                                                   input[3:0] K;                                                         reg[16:0] kmode,count;                                             output carry,borrow;                                                                                        wire  carry,borrow;                                            always @(K)                                                           begin                                                                  case(K)                                                             4'd1:kmode=17'd7;        4'd2:kmode=17'd15;       4'd3:kmode=17'd31;       4'd4:kmode=17'd63;       4'd5:kmode=17'd127;      4'd6:kmode=17'd255;      4'd7:kmode=17'd511;      4'd8:kmode=17'd1023;     4'd9:kmode=17'd2047;     4'd10:kmode=17'd4096;    4'd11:kmode=17'd8191;    4'd12:kmode=17'd16383;   4'd13:kmode=17'd32767;   4'd14:kmode=17'd65535;4'd15:kmode=17'd131071;default:kmode=17'bz;                                             endcase                                                               end                                                                  always @(posedge clk or reset)                                                 begin                                                                 if(!reset)  count=0;                                 else if(se) begin if(count==0) count=kmode[16:1];                     else  count=count-1;                             end                                                       else begin if(count==kmode)  count=kmode[16:1];                 else count=count+1;                                           end                                                              end assign carry=(count>=kmode-7)&&(~se); assign borrow=(count<=7)&&se;                                                                   endmodule