TNETX3150A datasheet(19/78 Pages) TI

19 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

unknown multicast port-routing register, unkmultiports at 0x06–0x07 (DIO)

BYTE 1

BYTE 0

BIT

Reserved

Unkmultiports

Initial values after reset

The unkmultiports register is used to route multicast frames whose multicast address is not found within the

lookup table. Normally these frames are flooded to all ports except to the port that originated the frame. The

TNETX15AE uses the unkmultiports register to route these frames to only selected ports. When the

TNETX15AE uses the unkmultiports register for multicast flooding, it increments the unkmultictr counter. The

TNETX15AE masks out the originating port when using this register. This prevents the attached switch from

forwarding the frame to its originating port.

The bit numbers in this register have a one-to-one correspondence with the attached switch-device port number.

This register is readable/writeable and is auto-loaded from the EEPROM when the RESET terminal is asserted

low or when LOAD in the control register is set.

mode control status register, control at 0x08–0x09 (DIO)

BYTE 1

BYTE 0

BIT

RESET

LOAD

START

INITD

NEEPM

NAUTO

Reserved

NLRN0

NCRC

Reserved

Initial values after reset

No EEPROM detected

Auto loading fails

The control register is automatically loaded from the EEPROM when the RESET terminal is asserted low, or

when the LOAD bit is set. Only selected bits in this register are loaded from the EEPROM. RESET and LOAD

bits are not loaded to prevent automatic loading loops. The two status bits, INITD and NEEPM, also are not

loadable. If automatic loading fails due to EEPROM malfunction or CRC error, the control register RESET bit

is set.

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