TNETX15VE datasheet(33/113 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

interrupt register, int at 0x28–0x29 (DIO)

The int register is used with the intmask register to provide interrupts to the attached CPU. When TNETX15VE

EINT terminal is 1, this register gives the reason for the interrupt. Specific interrupts can be masked out by

setting the appropriate bit in intmask register. This register is read only with the exception of the int bit. All bits

in a byte are automatically cleared when the byte is read, even if more then one was set.

BYTE 1

BYTE 0

BIT

NEW

NEWM

CHNG

CHNGM

SECVIO

SECVIOM

AGE

AGEM

INT

FNDCPLT

Reserved

RXFIFO

STAT

FULL

Initial Values After Reset

BIT

NAME

FUNCTION

NEW

New-node interrupt. NEW indicates that a new node has been added to the lookup table using a wire ADD. The node

address is given in the newnode register and the node’s port is given in the newport register.

NEWM

Missed-new-node interrupt indication. NEWM indicates that a new node interrupt was given, but the information was not

placed in the newnode registers because the registers have not been released by a host read of the most-significant

byte of the newport register.

CHNG

Node-port change interrupt. CHNG indicates that there has been a change in port assignment for a node that exists in

the lookup table. The node address is given in the newnode register and the node’s new port is given in the newport

CHNGM

Missed-node-port change interrupt indication. CHNGM indicates that a node-port change interrupt was issued, but the

information was not placed in the newnode registers because the registers have not been released by a host read of

the most-significant byte of the newport register.

SECVIO

Security-violation interrupt. SECVIO indicates that a node (which has been secured) has attempted to move port

assignments. The node address is given in the newnode registers. The location that the node attempted to move to is

contained in the newport register.

SECVIOM

Missed-security-violation interrupt indication. SECVIOM indicates that a node-port change interrupt was issued, but the

information was not placed in the newnode registers because the registers have not been released by a host read of

the most-significant byte of the newport register.

AGE

Age-out interrupt. AGE indicates that a node has been aged-out (deleted from the lookup table). The node address is

issued in the agednode register. The node’s assigned port is given in the agedport register.

AGEM

Missed-age-out interrupt indication. AGEM indicates that an age-out interrupt was issued, but the information was not

placed in the agednode registers because the registers have not been released by a host read of the most-significant

byte of the agedVLAN register.

INT

Test interrupt request. Asserting INT gives a test interrupt to the attached CPU.

FNDCPLT

Find completion interrupt. FNDCPLT indicates that the FIND logic operation has completed a search operation. The data

in the find registers is now valid.

5–3

Reserved

Writes to this location are ignored and read as 0.

RXFIFO

Receive FIFO has become not empty. The RXFIFO bit indicates that the RXFIFO has moved from being empty to not

empty. To set again, RXFIFO must be emptied and receive data again.

STAT

Statistics overflow interrupt. STAT indicates that a counter in the statistics is one-half full (most-significant bit in the

counter is a 1). This is an indication to the CPU to read the statistic counters (thereby clearing them).

FULL

SRAM full interrupt. FULL indicates that a condition existed (or exists) that prevented the adding of another address to

the TNETX15VE address-lookup table. Either the external RAM (table pointers), or the internal RAM (table entries) filled

up.

If NAUTO (bit 10, control 0x9) is set, the host is responsible for adding addresses. The host-initiated ADD operation did

not complete, and the FULL interrupt was asserted. The host must delete addresses until the ADD completes, or further

ADDs are stalled.

If NAUTO is not set, the internal state machines have taken care of deleting the necessary oldest addresses until the

ADD operation completes, even if the ADD was initiated by the host. In this case, the interrupt is an indication that the

table is operating near peak capacity.

TNETX15VE 数据表(PDF) 33 Page - Texas Instruments

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