TNETX15AE datasheet(30/78 Pages) TI

30 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

new-address port register, newport at 0x36–0x37 (DIO)

BYTE 3

BYTE 2

BIT

VALID

Reserved

PORTCODE

Reserved

OLDPORT

Initial values after reset

BIT

NAME

FUNCTION

VALID

Valid address indication.

14–12

Reserved

Writes to this location are ignored and read as 0.

11–8

PORTCODE

Current port for node. The PORTCODE field holds the assigned port number for the address contained in the

newnode register.

7–4

Reserved

Writes to this location are ignored and read as 0.

3–0

OLDPORT

Old port for address. When an address moves port locations, OLDPORT contains the old port location for the

address. When a security-violation interrupt is asserted by the TNETX15AE, the SECVIO bit is set in the int register,

and OLDPORT shows the port where the node attempted to move.

agednode interrupt interface group at 0x40–0x46 (DIO)

BYTE 3

BYTE 2

BYTE 1

BYTE 0

DIO

ADDRESS

Agednode23–Agednode16

Agednode31–Agednode24

Agednode39–Agednode32

Agednode47–Agednode40

0x40

Agedport

Agednode7–Agednode0

Agednode15–Agednode8

0x44

The agednode interrupt interface is used with the int and intmask registers to pass information to the

management agent about addresses that have been deleted from the lookup table due to the internal aging

process. The information placed in these registers (written in Ethernet native data format) is valid only when

the AGE bit in the int register is set to a 1. These registers are read only and default to 0 after reset.

To prevent the data in these registers from being changed if another interrupt occurs while reading the current

data, the data in these registers is locked until the agedport register is read.

aged-address register, agednode at 0x40–0x45 (DIO)

On an age interrupt, the agednode registers contain the address of the node that has been aged out from the

lookup table. This is a read-only register and defaults to 0x00.00.00.00.00.00 after reset. A different interrupt

is issued if this information remains unread long enough that another node is aged out before the agednode

registers are released.

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