TNETX15AE datasheet(75/78 Pages) TI

75 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

TNETX15AE/TNETX3150/TNETX3150A stand-alone applications

unmanaged switch

The simplest application for the TNETX15AE device is shown in Figure 28. This is an unmanaged multiport

switch. The TNETX15AE is responsible for matching addresses, learning addresses, and for eliminating (aging

out) old addresses. The TNETX15AE also provides options to the manufacturer through its EEPROM. The

manufacturer could program this EEPROM through a parallel-port interface to the TNETX15AE. Options that

can be set are SRAM size, the aging time, and where unknown unicast and multicast frames go. This is the

lowest-cost solution for an unmanaged multinode-per-port switch. This is the architecture of the TI evaluation

module (EVM).

PHY

TNETX3150/

TNETX3150A

EEPROM

OSC

TNETX15AE

Parallel Port

SRAM

DIO

Multiports

EEPROM

Figure 28. Lowest Cost Unmanaged Multiport Switch

managed switch

The microprocessor (CPU) interfaces to the TNETX3150/TNETX3150A/TNETX3100 through a common DIO

interface. The microprocessor also can manage any PHY through an IEEE Std 802.3u MII interface using the

SIO register in the TNETX15AE.

The microprocessor’s tasks are minimized mainly because the CPU does not have to participate in frame

matching. The microprocessor is used to set TNETX15AE/TNETX3150/TNETX3150A modes, secure

addresses so that the node does not move ports (useful for routers, attached switches, and servers), and

respond to control MIB requests.

The TNETX15AE is designed for easy management of the lookup table. Address-table lookups, adds, edits,

and deletes are performed easily through the TNETX15AE registers. Interrupt support in the TNETX15AE also

simplifies the management tasks. The TNETX15AE can give an interrupt to the CPU when the lookup table

changes due to a wire event. This minimizes code, as the CPU does not have to actively poll a large address

table for changes.

In-band signaling (see Figure 29) must be done with a MAC device connected to one of the switch ports. There

is no access to the data stream via the DIO port on the TNETX3150/TNETX3150A/TNETX3100 or the

TNETX15AE. Both devices affect the ability of a port to receive or forward packets; the packet itself is received

and transmitted via a regular switch port.

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