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TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

management-table lookup interface at 0x0B–0x16 (DIO)

BYTE 3

BYTE 2

BYTE 1

BYTE 0

DIO ADDRESS

FindVLANID

0x08

Findnode23–Findnode16

Findnode31–Findnode24

Findnode39–Findnode32

Findnode47–Findnode40

0x0C

Findport

Findnode7–Findnode0

Findnode15–Findnode8

0x10

Findcontrol

Findnodeage

0x14

The management-table lookup registers allow the management entity to find information about the node

addresses contained in the table.

These registers are part of the address lookup/inspection mechanism supported through the DIO (host)

interface. An address is fully described by the six bytes of findnode (0xC to 0x11), and one byte of findVLANID

(0xB). Duplicate MAC addresses are handled as long as they are made unique by residing on different VLANs.

Data about an address is returned in findport (0x12). FIND commands are issued through the findcontrol (0x16)

To cause a FIND operation to execute, the host writes to the findcontrol register (0x16). If a generalized FIND

command is executed (findfirst), the target address is returned in two parts; the MAC address is returned in six

bytes of findnode registers, and the VLANID of that address (actually the VLANID of the port that the addresss

resides on) is returned in findVLANID. If a successive FIND command is executed (findnext), the starting point

to continue the search is the six bytes of findnode and the one byte of findVLANID. The results are returned in

the same registers, overwriting the original values. These registers are read/write between FINDS; the search

picks up with the previous FIND (which loaded these registers), or values left by writes from the host interface.

If a lookup on an address to check parameters is executed, the data returned corresponds to the value in the

six bytes of findnode and one byte of findVLANID when the lookup command was given; the address

parameters are posted in the findport register (0x12, 0x13). The FIND operation completion is detected when

the command bit is written back to 0 (poll) or when the FNDCPLT interrupt is given. The find register block is

discussed later in further detail in numerical order.

lookup VLAN tag register, findVLANID at 0x0B (DIO)

BIT

Reserved

VLANID

Initial Values After Reset

The findVLANID register returns the associated VLANID code for the node contained in the findnode registers

on a lookup logic operation. On a FIND operation with the VLAN modifier active, the FIND logic operation uses

this register’s VLANID for searches.

FindVLANID register is a read/write register. When the FIND logic operation is operating, this register is locked

and writes are ignored.

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