TNETX3150A datasheet(24/78 Pages) TI

24 / 78 page

TNETX15AE

ADDRESS-LOOKUP DEVICE

SPWS041A – AUGUST 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

node age-stamp register, findnodeage at 0x14–0x15 (DIO)

BYTE 1

BYTE 0

BIT

NODEAGE

Initial values after reset

The findnodeage register is a read-only register, which holds the current 16-bit age-time stamp of the address

contained in the findnode register after a find command executes. Age units are seconds. The time stamp

indicates when this address was last seen.

lookup table search control register, findcontrol at 0x16 (DIO)

The management logic uses the findcontrol register to scan the lookup table for addresses. Three commands

are available: findfirst (FIRST), findnext (NEXT), find (LKUP). Only one command is valid at one time. Example:

a findfirst and a findnext command cannot be issued at the same time (0x06). The TNETX15AE ignores all

multiple commands. This register is readable/writeable. Further accesses of this register are delayed until the

operation is complete; that is, SRDY does not go active until the FIND state machine is done. This can produce

a 6.4-

µs read or write cycle if this register is accessed right after a FINDNEXT is started on a sparsely loaded

table.

BIT

FOUND

Reserved

FIRST

LKUP

Initial values after reset

BIT

NAME

FUNCTION

FOUND

Address found. If the address contained in the findnode register is found in the table, FOUND is asserted. The data

contained in the find interface (findnode, findport, and findnodeage) is valid only when this bit is a 1. This is a read-only

bit.

6–3

Reserved

FIRST

Lookup first address. When FIRST is 1, the TNETX15AE scans the address table for the first valid address. If FOUND

is set, the address parts are placed in findnode, findport, and findnodeage.

Lookup next addresses. When asserted, the TNETX15AE scans the address table for the next available address after

the address currently in the findnode registers (0xC–0x11). If FOUND is set, the address parts are placed in findnode,

findport, and findnodeage.

LKUP

Address lookup. When asserted, the TNETX15AE scans the address table for the address contained in the findnode

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