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RM48L952: RM48 Multicast

user4798698
Prodigy 20 points
Part Number: RM48L952

I have implemented unicast and broadcast communication on the Hercules RM48x Development Kit, but I can't implement multicast. Can you provide a demo or do I need to have any EMAC's register settings?

  • 0
    TI__Guru**** 193086 points
    Hello,

    You need to enable the multicast first by setting the RXMBPENABLE register for multicast. The RXMULTEN bit in RXMBPENABLE determines if hash matching multicast frames are enabled or filtered.

    You also need to set the MACHASH1 and MACHASH2 registers up to match the multicast address you want to listen to. It's a hash, so it takes the 48 bits of the MAC address and hashes down to a single bit position. You have to set that position in the HASH registers.

    In addition, you have to do things to set up the rx channel that you are sending the Multicast packets to.
  • 0 in reply to QJ Wang
    Prodigy 20 points
    hello,
    I have set the RXMULTEN bit in RXMBPENABLE register, but how the 64-bit data of the MACHASH1 and MACHASH2 registers value is calculated.
  • 0 in reply to user4798698
    TI__Guru**** 193086 points
    Hello,

    Have you make the multicast working after set the RXMULTEN bit and MACHASH1 and MACHASH2 registers?