TNETX15VE datasheet(27/113 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-node address register, findnode at 0x0C–0x11 (DIO)

BYTE 3

BYTE 2

BYTE 1

BYTE 0

DIO ADDRESS

Findnode23–Findnode16

Findnode31–Findnode24

Findnode39–Findnode32

Findnode47–Findnode40

0x0C

Findnode7–Findnode0

Findnode15–Findnode8

0x10

The findnode registers are used to exchange addresses between the TNETX15VE and the management CPU.

The node address in findnode is kept in Ethernet native data format. The function of findnode depends on the

bits set in findcontrol:

• On FIRST operations, this register shows the first address in the lookup table. The data in findnode is

valid only when the FOUND bit in findcontrol is a 1.

• On NEXT operations, this register shows the next address in the lookup table. The data in findnode is

valid only when the FOUND bit in findcontrol is a 1.

• OnLKUPoperations,thelookuplogicoperationlooksuptheaddressstoredinthisregister.Iffound,the

FOUND bit in findcontrol is set to a 1.

• On NEW operations, this register shows the first address in the lookup table that has the NEW flag set.

The data in findnode is valid only when the FOUND bit in findcontrol is a 1.

• On NBFR operations, this register shows the first location of the NBLCK RX FIFO. This FIFO stores

source address and port information on frames received where the destination address information in

the table is tagged with the NBLCK (no block) bit. This FIFO is intended to allow the reception of, and

response to, BPDUs during the early states of spanning tree when all other traffic is blocked, and can be

used for other operations since any address can have its NBLCK bit set. The data in findnode is valid

only when the FOUND bit in findcontrol is a 1.

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

can be performed to it.

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