TNETX15AE datasheet(32/78 Pages) TI

32 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

add routing code register, addport at 0x3E–0x3F (DIO)

The addport register is used to set or change port and flag assignments for the node address contained in the

addnode register. The definition for the addport register depends on whether the address stored in the addnode

This interface is used by the host to enter broadcast, multicast, and unicast addresses to the TNETX15AE table.

Wire ADDs operate on packet-source addresses, and all of these are forced to unicast addresses.

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

BYTE 3

BYTE 2

BIT

Reserved

SECURE

LOCKED

CUPLNK

PORTCODE

Reserved

Initial values after reset

BIT

NAME

FUNCTION

Reserved

Writes are ignored and read as 0.

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 register.

Addresses tagged by this bit add the port (specified in the uplinkports register) to the routing code.

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. This field is

writeable, and can be used to redirect traffic.

7–0

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

Reserved

PORTFLAG

Initial values after reset

BIT

NAME

FUNCTION

Reserved

Writes are ignored and read as 0.

14–0

PORTFLAG

PORTFLAG for multicast. PORTFLAG is the port assignment for the multicast address contained in the addnode

assignment.

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