INT received
- repeat
-- get data
- until EOF or Length > 1518 <-- ethernet type II frame
- until EOF or Length > 1526 <-- complete ethernet frame
- if length > 1518 then discard
- if (checksum(data)==data[1515..1518]) then
-- if (data[0..5]==my_mac_address) or (data[0..5]==0xffffffffffff) then
--- if (data[C..D]==0x0800 then goto ip_received
--- if (data[C..D]==0x0806 then goto arp_received
--- if (data[C..D]==0x0835 then goto rarp_received
-- endif
- endif


ip_received
offset = 0x000E
- if (data[0] AND#&F0) == 4 then		\ only IPv4
-- if (checksum(data)==data[A..B]) then		\ only valid crc
--- if (data[8..9]==0x01) then goto icmp_received
--- if (data[8..9]==0x06) then goto tcp_received
--- if (data[8..9]==0x17) then goto udp_received
-- end if
- end if