TNETX15VE datasheet(40/113 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

If addnode is a unicast address, (addnode (40) = 0), addport is defined as follows:

BYTE 3

BYTE 2

BIT

NBLCK

SECURE

LOCKED

CUPLNK

PORTCODE

NEW

Reserved

Initial Values After Reset

BIT

NAME

FUNCTION

NBLCK

Not-blocked indication. NBLCK sets the RXblock override function.

• If NBLCK is set, frames destined for this node are forwarded even if the corresponding RXblock bit for

the port is set.

• If NBLCK is not set, frames are forwarded only if the RXblock bit for the port is not set.

SECURE

Secured address flag. SECURE is used to change the security level for the address contained in the

addnode register.

LOCKED

Locked address flag. LOCKED locks/unlocks the address contained in the addnode register on an add

operation. Locked addresses output a discard code on the EAM interface.

CUPLINK

Copy frames to uplink flag. CUPLINK sets the copy uplink status for the address contained in the addnode

11–8

PORTCODE

Current port code for address. The value in PORTCODE becomes the port to which packets (sent to this

address) are forwarded. In addresses that are added automatically to the table, the source port goes to this

field, and the VLAN assigned to that port becomes part of the address (see principles of operation, SRAM

allocation, lookup table SRAM allocation). This field is writeable, and can be used to redirect traffic.

However, losing the VLANid to port synchronization results in leaky VLANs.

NEW

New-address indication. NEW changes the NEW field for the node contained in the addnode register. This

address can now be found easily by a NEW find command.

6–0

Reserved

Writes to this location are ignored and read as 0.

If addnode is a multicast address, (addnode (40) = 1), addport is defined as follows:

BYTE 3

BYTE 2

BIT

NBLCK

PORTFLAG

Initial Values After Reset

BIT

NAME

FUNCTION

NBLCK

Not-blocked flag. NBLCK sets the RXblock register override for the multicast address contained in the

addnode register.

• If NBLCK is set, frames destined for this multicast address are forwarded even if the corresponding

RXblock register bit for the port that originated the frame is set.

• If NBLCK is not set, frames are forwarded only if the RXblock register bit for the port that originated

the frame is not set.

14–0

PORTFLAG

Current PORTFLAG for multicast. PORTFLAG changes the port assignment for the multicast address

contained in the addnode register. The bit values in this field correspond one-to-one with the

TNETX3150/TNETX3150A port assignment. It is the user’s responsibility not to put a value in this field that

would cause leaky VLANs.

TNETX15VE Datasheet(PDF) 40 Page - Texas Instruments

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