LAN91C110 datasheet(32/55 Pages) SMSC

32 / 55 page

FEAST Fast Ethernet Controller for PCMCIA and Generic 16-Bit Applications

SMSC DS – LAN91C110 REV. B

Page 32

Rev. 09/05/02

BANK3

OFFSET

NAME

TYPE

SYMBOL

0 THROUGH 7

MULTICAST TABLE

READ/WRITE

LOW

BYTE

MULTICAST TABLE 0

HIGH

BYTE

MULTICAST TABLE 1

LOW

BYTE

MULTICAST TABLE 2

HIGH

BYTE

MULTICAST TABLE 3

LOW

BYTE

MULTICAST TABLE 4

HIGH

BYTE

MULTICAST TABLE 5

LOW

BYTE

MULTICAST TABLE 6

HIGH

BYTE

MULTICAST TABLE 7

The 64 bit multicast table is used for group address filtering. The hash value is defined as the six most significant bits of

the CRC of the destination addresses. The three msb's determine the register to be used (MT0-MT7), while the other

three determine the bit within the register.

If the appropriate bit in the table is set, the packet is received.

If the ALMUL bit in the RCR register is set, all multicast addresses are received regardless of the multicast table values.

Hashing is only a partial group addressing filtering scheme, but being the hash value available as part of the receive

status word, the receive routine can reduce the search time significantly. With the proper memory structure, the search is

limited to comparing only the multicast addresses that have the actual hash value in question.

LAN91C110 Datasheet(PDF) 32 Page - SMSC Corporation

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