Datasheet

 2010 Microchip Technology Inc. DS39935C-page 101
ENC424J600/624J600
10.10 Magic Packet™ Collection Filter
The Magic Packet filter scans all packet contents for a
Magic Packet pattern for the local MAC address. If a
valid Magic Packet pattern is found, then the frame will
be accepted. The Magic Packet pattern consists of a
sync pattern of six FFh bytes, followed by the MAC
address of the station the Magic Packet is intended for,
repeated 16 times. See Figure 10-2 for a sample Magic
Packet. This pattern may be located anywhere within
the packet. Other fields in the packet, such as the
destination address or bytes preceding or following the
Magic Packet pattern, are ignored.
This filter is disabled at power-up. To enable this filter,
set MPEN (ERXFCON<14>). If the filter is disabled or
the received packet is not a Magic Packet, the frame
will be passed to the next lower priority filter.
FIGURE 10-2: SAMPLE MAGIC PACKET™ FORMAT
Source Address
FCS
Destination Address
Type/Length
FF FF FF FF FF FF
08 00
09 0A 0B 0C 0D
0E
Received
Data Field
00 01 1A 00 CA FE
EF 54 32 10
FF FF FF FF FF 00
FF FF FF FF FF FF
00 04 A3 11 23 33
19 1A 1B 1C 1D
1E
Data
Sync Pattern
Sixteen Repeats of
the MAADR MAC Address
Comments
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33
00 04 A3 11 23 33