TNETX15VE datasheet(66/113 Pages) TI1

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TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

Although the TNETX15VE is designed to work in a CPU-less environment, access to the internal registers is

useful for the following reasons:

• Setting/changing port VLAN assignments

• Setting spanning-tree options

• Setting operational modes (startup options)

• Resetting the device (hardware and software resets)

• Management-based access and control of the lookup table

• Statistic gathering

• Diagnostic operations

• Communicating with attached PHYs through the MII

• Reading/writing to an external EEPROM

Figure 12 shows the various register spaces provided by and accessed through the TNETX15VE.

Address High

DIO

MII I/F

EEPROM I/F

SRAM I/F

Address Low

Data

Data Auto-

Increment

SIO

RAM Addr

RAM Data

SRAM

(external)

Serial EEPROM

MII/PHYs

4K x 16

SRAM

(internal)

TNETX15VE

Access Registers

Internal DIO

Registers

Figure 12. Register Spaces Provided and Accessed Through the TNETX15VE

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