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LAN91C100FD Datasheet(PDF) 38 Page - SMSC Corporation

Part # LAN91C100FD
Description  FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY
PDF  79 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN91C100FD Datasheet(HTML) 38 Page - SMSC Corporation

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FEAST Fast Ethernet Controller with Full Duplex Capability
Rev. 10/14/2002
Page 38
SMSC DS – LAN91C100FD Rev. D
PRELIMINARY
BANK3
OFFSET
NAME
TYPE
SYMBOL
0 THROUGH 7
MULTICAST TABLE
READ/WRITE
MT
LOW
BYTE
MULTICAST TABLE 0
0
0
0
0
0
0
0
0
HIGH
BYTE
MULTICAST TABLE 1
0
0
0
0
0
0
0
0
LOW
BYTE
MULTICAST TABLE 2
0
0
0
0
0
0
0
0
HIGH
BYTE
MULTICAST TABLE 3
0
0
0
0
0
0
0
0
LOW
BYTE
MULTICAST TABLE 4
0
0
0
0
0
0
0
0
HIGH
BYTE
MULTICAST TABLE 5
0
0
0
0
0
0
0
0
LOW
BYTE
MULTICAST TABLE 6
0
0
0
0
0
0
0
0
HIGH
BYTE
MULTICAST TABLE 7
0
0
0
0
0
0
0
0
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.
BANK 3
OFFSET
NAME
TYPE
SYMBOL
8
MANAGEMENT INTERFACE
READ/WRITE
MGMT
HIGH
BYTE
FLTST
MSK_
CRS100
0
0
1
1
0
0
1
1
LOW
BYTE
MDOE
MCLK
MDI
MDO
0
0
1
1
0
0
MDI Pin
0



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