Chapter 7: Ethernet AVB Endpoint Reception

VLAN Priority Match

rx_clk

rx_clk_enable

legacy_rx_data[7:0]

legacy_rx_data_valid

Match Pattern Register

Match Enable Register

DA

SA

VLAN L/T

DATA

 

 

 

 

 

 

 

 

 

 

 

 

0x81

0x00

0x20

 

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0x00

0xFF

0xFF

0xE0

0x00

 

 

 

 

 

 

Don’t-cares

 

 

 

 

VLAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

priority

 

filter

Figure 7-6:Filtering of VLAN Frames with a Specific Priority Value

The example illustrated in Figure 7-6shows a single MAC Header Filter (one of the eight provided) configured to filter on frames containing a VLAN tag with a VLAN Priority value of 1.

Any Other Combinations

Because the Match Pattern Register and Match Enable Register provide the ability to filter across any bitwise match/don’t-care pattern of the initial 128-bits of an Ethernet frame, match combinations of Destination Address, Length/Type Field (when no VLAN tag is present), VLAN fields (when present) can be selected with complete flexibility.

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Ethernet AVB Endpoint User Guide

 

 

UG492 July 23, 2010

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Xilinx UG492 manual Vlan Priority Match, Any Other Combinations