TNETX15VE datasheet(31/113 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

statistics registers at 0x17–0x1D (DIO)

BYTE 3

BYTE 2

BYTE 1

BYTE 0

DIO ADDRESS

Secvioctr

0x14

Unkmultictr

Unkunictr

0x18

Numnodes

0x1C

All registers in this field are read only and their default value after reset is 0.

security violation counter, secvioctr at 0x17 (DIO)

The secvioctr field contains the number of times that a secured address attempts to move ports. This register

generates a stat interrupt (statistics overflow interrupt) when it is one-half full (most-significant bit in the field

is 1). Reading this register automatically clears it and the default value of this register is 0x00.

unknown unicasts counter, unkunictr at 0x18–0x19 (DIO)

The unkunictr register counts the number of times that the TNETX15VE broadcasts a frame that has a unicast

destination address. These frames are used when the TNETX15VE is not able to find the destination address

in its lookup table. This register generates a stat interrupt (statistic overflow interrupt) when it is one-half full

(most-significant bit in the field is 1). The default value of this register is 0x0000. Reading the least-significant

byte loads the most-significant byte into a buffer register that is shared at the most-significant byte address for

unkunictr, unkmultictr, and numcodes. The least-significant byte should be read first, followed by the

most-significant byte, without initiating a read of another statistics counter. Reading the least-significant byte

also clears the counter.

unknown multicasts counter, unkmultictr at 0x1A–0x1B (DIO)

The unkmultictr register counts the number of times that the TNETX15VE broadcasts a frame that has a

multicast destination address. Multicast destination addresses are broadcast when the TNETX15VE is not able

to find the destination address in its lookup table. This register generates a stat interrupt (statistics overflow

interrupt) when it is one-half full (most-significant bit in the field is 1). The default value of this register is 0x0000.

Reading the least-significant byte loads the most-significant byte into a buffer register that is shared at the

most-significant byte address for unkunictr, unkmultictr, and numcodes. The least-significant byte should be

read first, followed by the most-significant byte, without initiating a read of another statistics counter. Reading

the least-significant byte also clears the counter.

lookup table node count, numnodes at 0x1C–0x1D (DIO)

The numnodes counter register contains the number of addresses currently in the lookup table. This register

is read only and its value at reset is 0x0000. Reading the least-significant byte loads the most-significant byte

into a buffer register that is shared at the most-significant byte address for unkunictr, unkmultictr, and numcodes.

The least-significant byte should be read first, followed by the most-significant byte, without initiating a read of

another statistics counter.

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