TNETX15VE datasheet(28/113 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

lookup routing-code register, findport at 0x12–0x13 (DIO)

The findport register is a read-only register, except for the portcode field, which returns port assignment

information for the node address contained in the findnode register after a lookup. The data structure for the

findport register depends on the type of address stored in the findnode register or whether the NBCLK FIFO

was searched.

If findnode contains a unicast address, findnode (40) = 0 (bit 40 of the Ethernet adddress is 0):

BYTE 3

BYTE 2

BIT

NBLCK

SECURE

LOCKED

CUPLNK

PORTCODE

NEW

Reserved

Initial Values After Reset

BIT

NAME

FUNCTION

NBLCK

Not blocked indication. NBLCK overrides the RXblock register.

• If NBLCK is 1, frames destined for this node are forwarded even if the corresponding RXblock bit for

the port that originated the frame is set.

• If NBLCK is 0, frames are forwarded only if the RXblock bit for the port that originated the frame is

not set.

SECURE

Secured address indication. SECURE shows the security level for the address contained in the findnode

moves ports, a security violation interrupt is given to the host, and the address is locked.

LOCKED

Locked address indication. LOCKED shows the lock status for the address contained in the findnode

addresses are not delivered.

CUPLNK

Copy frames to uplink indication. CUPLINK shows the copy uplink status for the address contained in the

findnode register. The address tagged by this bit adds the port specified in the uplinkports register to the

routing code. This can affect performance of the TNETX3150/TNETX3150A, as each packet must be linked

to at least two transmit queues.

11–8

PORTCODE

Current port for node. PORTCODE holds the current port for the unicast address shown in the findnode

This field is read/writeable. When the FIND logic is operating, this register is locked and no writes can be

performed to it.

NEW

New address indication. NEW shows that the node contained in the findnode registers has been added, or

its port has changed, or it has been part of a security violation after the last access by management, or had

its NEW bit explicitly set as part of a management add/edit. The FIND state machine clears this bit when

finding the node.

6–0

Reserved

Writes to this location are ignored and read as 0.

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