Hi, In the verilog code of this ethernet ip core, I found that the data of txd[3:0] vary at the positive edge of tx_clk. Then, there is no setup time for the data. Why? _____________________________________________ �����ݳ��������Ƽ� http://shopping.263.net/category16.htm ǧ�ֻ�ױƷ�������� http://shopping.263.net/category04.htm