CX82100 Home Network Processor Data Sheet
Figure 7-9. Imperfect Address Filtering
47 46
IG
0
Destination Address
CRC Logic
32-bit CRC
31
9
8
0
5
4
16
0
0
if IG=1
if IG=0
Hash Table
(32x16)
hit/miss
31
one physical
address
101545_036
Example of an Imperfect Address Filtering Setup Frame
Table 7-6 displays seven multicast addresses to be filtered imperfectly and one unicast
address to be filtered perfectly. The corresponding setup frame is displayed in Figure
7-10.
Table 7-6. Hash Index Generated Using Ethernet CRC Algorithm
Multicast/Unicast
Ethernet Address
32-Bit CRC Value in
Little-Endian Mode
Hash Index:
(Most Significant 9
Bits of the CRC Value)
Addresses Subject to Imperfect Filtering
0xD57701F6
0x8C14FEBE
0x3BE71E3C
0x4D69365E
0xD4BE5976
0x18883CD2
0x78081873
—
0x1F6
0x0BE
0x03C
0x05E
0x176
0x0D2
0x073
—
(2) D9-C2-C0-99-0B-82
(3) E7-C1-96-36-89-DD
(4) 85-00-25-00-27-00
(5) 9D-48-4D-FD-CC-0A
(6) C1-CC-28-55-D3-C7
(7) AB-46-0A-55-2D-7E
3A-12-C2-56-DE-91
Physical Address Subject to Perfect Filtering
7-20
Conexant Proprietary and Confidential Information
101306C
CONEXANT [ CONEXANT SYSTEMS, INC ]
