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shijiluoben
Observer
Observer
4,349 Views
Registered: ‎04-10-2008

How to disable CRC check and let the opb_emac accept anything that come in?

I can only find XEM_PROMISC_OPTION to accept data from any address. Cant find crc one.

Thanks.

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brouhaha
Explorer
Explorer
4,334 Views
Registered: ‎08-14-2007

The OPB EMAC doesn't have any feature to allow reception of packets with bad FCS (CRC).  It can only count them and give a receive error interrupt.  This is stated on page 51 of the data sheet for OPB EMAC version 1.04a , DS 435 dated July 26, 2006.

 

IMNSHO, there should have been two additional bits in the EMACcontrol register, one to cause the FCS of received packets to be stored in the receive buffer, and one to prevent received packets with bad FCS from being discarded.

 

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