TNETX15AE datasheet(31/78 Pages) TI

31 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

aged-address port assignment, agedport at 0x46 (DIO), byte 2

BIT

Reserved

PORTCODE

Initial values after reset

BIT

NAME

FUNCTION

7–4

Reserved

Writes to this location are ignored and read as 0.

3–0

PORTCODE

Agednode port assignment. PORTCODE displays the assigned port for the aged-out address contained in the

agednode register.

management add/edit address interface group at 0x2C and 0x38–0x3F (DIO)

BYTE 3

BYTE 2

BYTE 1

BYTE 0

DIO

ADDRESS

Adddelcontrol

0x2C

0x30

0x34

Addnode23–Addnode16

Addnode31–Addnode24

Addnode39–Addnode32

Addnode47–Addnode40

0x38

Addport

Addnode7–Addnode0

Addnode15–Addnode8

0x3C

The management add/edit address registers are used with the ADD bit in the adddelcontrol register to perform

CPU adds and edits to the lookup table. These registers are normally readable/writeable. As long as the ADD

bit in the addelcontrol register is high, writes to these bytes are ignored.

lookup table add/delete command register, adddelcontrol at 0x2C (DIO), byte 0

BYTE 0

BIT

Reserved

ADD

DEL

Initial values after reset

BIT

NAME

FUNCTION

7–2

Reserved

Writes to this location are ignored and are read as 0.

ADD

Address add. When ADD is asserted, the TNETX15AE uses the information contained in the management add/edit

address interface to add or edit an address in the lookup table. ADD remains asserted until the add process is complete.

DEL

See the delete command bit description and the description of the delnode registers (0x48–0x4f).

The adddelcontrol register can be read at any time. If the ADD or DEL bit is being written and that bit is already

set, the DIO interface will stall and SRDY will be delayed until the current cycle completes. If neither of these

two bits is already set during a write, a normal cycle results.

add address register, addnode at 0x38–0x3D (DIO)

The unicast or multicast address in this register (written in Ethernet native data format) is added to the lookup

table when the ADD bit in the adddelcontrol register is set to 1, along with the data in the addport register. The

default value of this register after reset is 0x00.00.00.00.00.00.

TNETX15AE 数据表(PDF) 31 Page - Texas Instruments

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