LAN9118MT Standard Microsystems (SMSC), LAN9118MT Datasheet - Page 32

• Manufacturer Part Number: LAN9118MT
• Manufacturer: Standard Microsystems (SMSC)

Revision 1.0 (03-17-05)
4.4.2.1
4.4.2.2
of 00000 selects Bit 0 of the multicast hash table low register and a value of 11111 selects Bit 31 of
the multicast hash table high register.
Hash Perfect Filtering
In hash perfect filtering, if the received frame is a physical address, the LAN9118 Packet Filter block
perfect-filters the incoming frame’s destination field with the value programmed into the MAC Address
High register and the MAC Address Low register. If the incoming frame is a multicast frame, however,
the LAN9118 packet filter function performs an imperfect address filtering against the hash table.
The imperfect filtering against the hash table is the same imperfect filtering process described in the
“Hash Only Filtering” section above.
Inverse Filtering
In inverse filtering, the LAN9118 Packet Filter Block accepts incoming frames with a destination
address not matching the perfect address (i.e., the value programmed into the MAC Address High
register and the MAC Address Low register in the CRC block and rejects frames with destination
addresses matching the perfect address.
For all filtering modes, when MCPAS is set, all multicast frames are accepted. When the PRMS bit is
set, all frames are accepted regardless of their destination address. This includes all broadcast frames
as well.
DATASHEET
32
High-Performance Single-Chip 10/100 Non-PCI Ethernet Controller
SMSC LAN9118
Datasheet