TNETX3150A datasheet(33/78 Pages) TI

33 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

management delete address interface group at 0x2C, 0x48–0x4F (DIO)

BYTE 3

BYTE 2

BYTE 1

BYTE 0

DIO

ADDRESS

Adddelcontrol

0x2C

0x30

0x34

0x38

0x3C

0x40

0x44

Delnode23–Delnode16

Delnode31–Delnode24

Delnode39–Delnode32

Delnode47–Delnode40

0x48

Delnode7–Delnode0

Delnode15–Delnode8

0x4C

The management delete address interface is used with the DEL bits in the adddelcontrol register to perform

management deletions from the lookup table.

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

See the add command-bit description and the description of the addnode registers (0x38–0x3f).

DEL

Address delete. When DEL is asserted, the TNETX15AE uses the information contained in the management delete

address interface to delete an address from the lookup table. DEL remains asserted until the delete process is complete.

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.

delete-node address register, delnode at 0x48–0x4D (DIO)

The delnode registers are used with the DEL bit in the adddelcontrol register to allow for management deletion

of an address in the lookup table. To delete an address, the address to be deleted is placed in Ethernet native

data format in this register, and the DEL bit in the adddelcontrol register is asserted. This register defaults to

0x00.00.00.00.00.00 after reset. These registers are normally read/write except when the DEL bit in the

adddelcontrol register is high; then, writes are ignored.

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