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ENC28J60T-C/ML 数据表(PDF) 49 Page - Microchip Technology

部件名 ENC28J60T-C/ML
功能描述  Stand-Alone Ethernet Controller with SPI Interface
PDF  96 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

ENC28J60T-C/ML 数据表(HTML) 49 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
Preliminary
DS39662B-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
register (Register 8-1). More than one filter can be active
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.



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