TNETX15VE datasheet(103/113 Pages) TI1

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TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997

103

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

TNETX15VE and TNETX3150/TNETX3150A stand-alone applications

unmanaged switch

The simplest application for the TNETX15VE is shown in Figure 28. This is an unmanaged multiport switch. The

TNETX15VE is responsible for matching addresses, learning addresses, and for eliminating (aging out) old

addresses. The TNETX15VE also provides options to the manufacturer through its EEPROM. The

manufacturer could program this EEPROM through a parallel-port interface to the TNETX15VE. Options that

can be set are SRAM size, the aging time, the VLANmask, tagVLAN, and VLANID registers (for this application,

they can be all set to the same VLAN and the VLANmask register (for that VLAN) is set to all ports). This is the

lowest-cost solution for an unmanaged, VLAN-capable, multinode-per-port switch.

Parallel Port

SRAM

EEPROM

TNETX15VE

TNETX3150/

TNETX3150A

DIO

OSC

PHY

EEPROM

Multiports

Figure 28. Lowest-Cost Unmanaged Multiport Switch

managed switch

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

microprocessor also has the capability to manage any switch PHY registers through an IEEE Std 802.3u MII

interface (SIO register).

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

matching. The microprocessor is used to set TNETX15VE and TNETX3150/TNETX3150A modes, secure

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

VLANs and spanning-tree options, and respond to control MIB requests.

The TNETX15VE is designed for easy management of the lookup table. Address table lookups, adds, edits,

and deletes are performed easily through the TNETX15VE registers. Interrupt support in the TNETX15VE also

simplifies the management’s tasks. The TNETX15VE gives an interrupt to the CPU when it changes the lookup

table. This minimizes code, as the CPU does not have to actively poll a large address table for changes.

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