TNETX15VE datasheet(44/113 Pages) TI1

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TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

VLAN routing mask registers, VLANmask at 0x50–0x6F (DIO)

BYTE 3

BYTE 2

BYTE 1

BYTE 0

DIO ADDRESS

VLANmask1

VLANmask0

0x50

VLANmask3

VLANmask2

0x54

Reserved

0x58

Reserved

0x5C

Reserved

0x60

Reserved

0x64

Reserved

0x68

Reserved

0x6C

Each VLANmask register corresponds one-to-one to a VLAN value. The TNETX15VE currently supports four

VLANs, but space is reserved for future inclusion of 16 VLANs. The VLANmask register has the following format:

BIT

Reserved

VLANmask

Initial Values After Reset

The VLANmask registers are used in two ways.

• When an address is not found, the VLANmask register (corresponding to the VLAN assigned to the

source port) is used as an unknown routing mask. Frames are forwarded to the ports specified in the

registers.

• When a multicast address is found in the lookup table, the lookup table port bit map is masked using the

VLANmask register corresponding to the VLAN assigned to the source port. The VLANmask masks

destination ports on a VLAN. The vectors for each VLAN allow the user to restrict broadcast traffic on

that VLAN to only the ports in that VLAN that require it.

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