将一条512bit报文长度分成4条。。。。。(always @(posedge clk_sys or negedge rst_sys_n) begin if(~rst_sys_n) begin data_line <= 2'b0 ; end else begin if((rx512_pkt_dataw[519] == 1'b1)&&(rx512_pkt_wr == 1'b1)) begin