在网上查到一个39进制的计数器，不知道怎么改成九进制的计数器，求解答module counter_39{ add, dec, counter }; input add; //为1时加操作 input dec; //为1时减操作 output [5:0] counter; reg [5:0] counter; always @(add and dec) begin if(add && !dec) begin if(counter == 6'd38) begin counter <= 6'd0; end else begin counter <= counter + 1'b1; end end if(!add and dec) begin if(counter == 6'd0) begin counter <= 6'd38; end else begin counter <= counter - 1'b1; end end endendmodule