LAN91C111 datasheet(61/125 Pages) MICROCHIP

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DS00002276A-page 61

LAN91C111

8.22

Bank 3 - Multicast Table Registers

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.

OFFSET

NAME

TYPE

SYMBOL

THROUG

H 7

MULTICAST TABLE

READ/WRITE

LOW

BYTE

MULTICAST TABLE 0

000

HIGH

BYTE

MULTICAST TABLE 1

000

LOW

BYTE

MULTICAST TABLE 2

000

HIGH

BYTE

MULTICAST TABLE 3

000

LOW

BYTE

MULTICAST TABLE 4

000

HIGH

BYTE

MULTICAST TABLE 5

000

LOW

BYTE

MULTICAST TABLE 6

000

HIGH

BYTE

MULTICAST TABLE 7

000

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