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ENC28J60-C/SP 数据表(PDF) 49 Page - Microchip Technology |
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ENC28J60-C/SP 数据表(HTML) 49 Page - Microchip Technology |
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49 / 96 page  © 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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