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Altera_Forum
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13 years ago

TSE Multicast Hash table issue

I have read & re-read the TSE hardware documentation describing the multicast address hash table and how it is supposed to work. I have written a function to process an Ethernet multicast addr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Hello, all.

I have the same issue.

The multicast address is 01-0C-CD-01-02-03

addr[07:00] = 0x03 the XOR of which is 0

addr[15:08] = 0x02 the XOR of which is 1

addr[23:16] = 0x01 the XOR of which is 1

addr[31:24] = 0xCD the XOR of which is 1

addr[39:32] = 0x0C the XOR of which is 0

addr[47:40] = 0x01 the XOR of which is 1

If I understand correctly, one should be written to the most significant bit of entry 0b101110 (0x2E).

So, I try to write 0x80000000 to the address HASH_TABLE_ADDR + 0x2E:

IOWR_ALTERA_TSEMAC_HASH_TABLE(TSE_BASE, 0x2E, 0x80000000);

But in fact I do not receive any multicast frames...

Note, that option "Include multicast hashtable" is turned on in my configurations, and MHASH_SEL bit is set to 0 (generate the 6-bit code from all 48 bits of the destination address).

I have no ideas what hapens...