LAN9250 datasheet(141/421 Pages) MICROCHIP

Il numero della parte	LAN9250

Spiegazioni elettronici	Integrated Ethernet PHY with HP Auto-MDIX

PDF	421 Pages

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Produttore elettronici	MICROCHIP [Microchip Technology]

Homepage	http://www.microchip.com

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141 / 421 page

 2015 Microchip Technology Inc.

DS00001913A-page 141

LAN9250

field, the controller will recognize the packet as a VLAN-tagged packet, allowing the packet to be received and pro-

cessed by the host software. If both VLAN1 and VLAN2 tag Identifiers are used, each should be unique. If both are set

to the same value, VLAN1 is given higher precedence and the maximum legal frame length is set to 1522.

FIGURE 11-1:

VLAN FRAME

Preamble

7 Bytes

SOF

1 Byte

Dest. Addr.

6 Bytes

Source Addr.

6 Bytes

Type

2 Bytes

Data

46-1500 Bytes

FCS

4 Bytes

Standard Ethernet Frame (1518 Bytes)

Preamble

7 Bytes

SOF

1 Byte

Dest. Addr.

6 Bytes

Source Addr.

6 Bytes

Type

2 Bytes

Data

46-1500 Bytes

FCS

4 Bytes

Ethernet Frame with VLAN TAG (1522 Bytes)

TPID

2 Bytes

Type

2 Bytes

TPID

2 Bytes

VLAN ID

12 Bits

User Priority

3 Bits

CFI

1 Bit

Tag Control Information

(TCI)

Defines the VLAN to

which the frame belongs

Canonical Address Format Indicator

Indicates the frame’s priority

Tag Protocol ID: \x81-00

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