嵌入式网口TX灯闪，PC网口接收灯也闪，但显示接收0字节？

只看该作者 · 2011-11-29 14:18

嵌入式以太网，发送代码如下：
when Copy01=> --destination mac address ffff ffff ffff
   HD<=X"FFFFFFFF";
when Copy02=>
   HD<=X"1111FFFF"; -- source mac address 1111 1111 1111
when Copy03=>
   HD<=X"11111111";
when Copy04=>
   HD<=X"00450008"; --type IP, IPv4=0100 ,
when Copy05=>
   HD<=X"00004800";--package size 72 bytes total
when Copy06=>
   HD<=X"00001140";
when Copy07=>
   HD<=X"CC01A8C0"; --source ip 192.168.1.204
when Copy08=>
   HD<=X"FFFFFFFF";  --destination ip address
when Copy09=>
   HD<=X"70177017";  -- port number
when Copy10=>
   HD<=X"00001c00";--  28 bytes data
when Copy11=>
   HD<=X"11111111";
when Copy12=>
   HD<=X"1111FFFF";
when Copy13=>
   HD<=X"11111111";
when Copy14=>
   HD<=X"11111111";
when Copy15=>
   HD<=X"FFFFFFFF";
when Copy16=>
   HD<=X"1111FFFF";
when Copy17=>
   HD<=X"11111111";
when Copy18=>
   HD<=X"1111FFFF";
when Copy19=>
   HD<=X"11111111";
实际上就发送了一个很小的IP帧。