TNETX15AE datasheet(23/78 Pages) TI

23 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 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, 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.

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

is defined as:

BYTE 3

BYTE 2

BIT

VALID

SECURE

LOCKED

CUPLNK

PORTCODE

Reserved

Initial values after reset

BIT

NAME

FUNCTION

VALID

Valid address indication.

SECURE

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

Secure addresses are not aged out and cannot move ports. If a station with a secured address moves ports, a security

violation interrupt is given to the host, and the address is locked. Since the lookup of the destination address causes

the queueing of the packet for transmit, and this happens before the source address is inspected, the packet that

causes a security violation is processed through the switch.

LOCKED

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

addresses output a discard code on the EAM interface; frames destined for LOCKED addresses are not delivered.

Since the destination address lookup, which causes the queueing of the packet for transmission, is independent of

checking the source address, locked addresses cannot receive packets (but still can transmit) into the switch attached

to TNETX15AE.

CUPLNK

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

on the EAM bus. This can affect performance of the TNETX3150/TNETX3150A/TNETX3100, as each packet must

be linked to two transmit queues.

11–8

PORTCODE

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

7–0

Reserved

Writes to this location are ignored and read as 0.

If findnode is a multicast address, findnode (40) = 1 (bit 40 of the Ethernet address is 1), then findport is

defined as:

BYTE 3

BYTE 2

BIT

VALID

PORTFLAG

Initial values after reset

BIT

NAME

FUNCTION

VALID

Valid address indication.

14–0

PORTFLAG

Port-bit vector for multicast. PORTFLAG shows the port-bit vector for the multicast address contained in the findnode

assignment.

TNETX15AE 数据表(PDF) 23 Page - Texas Instruments

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