LAN9420I-NU Standard Microsystems (SMSC), LAN9420I-NU Datasheet - Page 55

• Manufacturer Part Number: LAN9420I-NU
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9420I-NU

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
.
SMSC LAN9420/LAN9420i
3.5.3
MCPAS
PREAMBLE
PREAMBLE
(7 BYTES)
(7 BYTES)
X
0
0
0
0
Address Filtering Functional Description
The Ethernet address fields of an Ethernet packet, consists of two 6-byte fields: one for the destination
address and one for the source address. The first bit of the destination address signifies whether it is
a physical address or a multicast address.
The address check logic filters the frame based on the Ethernet receive filter mode that has been
enabled. Filter modes are specified based on the state of the control bits in
Filtering
more detail in
If the frame fails the filter, the MAC does not receive the packet. The Host has the option of accepting
or ignoring the packet.
(1 BYTE)
(1 BYTE)
SOF
PRMS
SOF
0
0
0
0
1
Modes", which shows the various filtering modes used by the MAC. These bits are defined in
DEST. ADDR.
(6 BYTES)
DEST. ADDR.
Section 4.4.1, "MAC Control Register (MAC_CR)," on page
(6 BYTES)
INVFILT
(2 BYTES)
SOURCE ADDR.
TPID
0
0
0
1
0
Table 3.13 Address Filtering Modes
(6 BYTES)
SOURCE ADDR.
(6 BYTES)
Figure 3.18 VLAN Frame
USER PRIORITY
DATASHEET
(3 BITS)
Tag Control Information
(2 BYTES)
HFILT
Tag Protocol D: \x81-00
TPID
0
0
1
0
X
(2 BYTES)
55
TYPE
(TCI)
Ethernet frame with VLAN TAG
Ethernet frame
(1518 BYTES)
(2 BYTES)
(1 BIT)
TYPE
CFI
(1522 BYTES)
Indicates frame's priority
HPFILT
0
1
1
0
X
(2 BYTES)
TYPE
(46 - 1500 BYTES)
(12 BITS)
VLAN ID
DATA
Canonical Address Format Indicator
MAC address perfect filtering only
for all addresses.
MAC address perfect filtering for
physical address and hash filtering
for multicast addresses
Hash Filtering for physical and
multicast addresses
Inverse Filtering
Promiscuous
(46 - 1500 BYTES)
VID: 12 bits defining the VLAN
to which the frame belongs
DATA
119.
DESCRIPTION
Table 3.13, "Address
Revision 1.4 (12-17-08)
(4 BYTES)
FCS
(4 BYTES)
FCS