Datasheet

 2006-2012 Microchip Technology Inc. . DS39662E-page 47

ENC28J60

8.0 RECEIVE FILTERS

To minimize the processing requirements of the host

controller, the ENC28J60 incorporates several different

receive filters which can automatically reject packets

which are not needed. Six different types of packet

filters are implemented:

• Unicast

• Pattern Match

•Magic Packet™

• Hash Table

• Multicast

• Broadcast

The individual filters are all configured by the ERXFCON

at any given time. Additionally, the filters can be config-

ured by the ANDOR bit to either logically AND, or

logically OR, the tests of several filters. In other words,

the filters may be set so that only packets accepted by

all active filters are accepted, or a packet accepted by

any one filter is accepted. The flowcharts in Figure 8-1

and Figure 8-2 show the effect that each of the filters will

have depending on the setting of ANDOR.

The device can enter Promiscuous mode and receive

all packets by clearing the ERXFCON register. The

proper setting of the register will depend on the

application requirements.