DP83266 datasheet(64/152 Pages) NSC

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70 Control Information (Continued)

Token and Timer Event Latch Register 0 (TELR0)

The Token and Timer Event Latch Register 0 (TELR0) informs software of time expirations of the Token Rotation Timer (TRT)

and Valid Transmission Timer (TVX) The TELR0 Register also reports token events such as duplicate token detection restrict-

ed token reception and general token capture and release The completion of the Ring Latency measurement is also indicated

in the TELR0 Register Each bit may be masked via the Token and Timer Event Mask Register (TEMR0)

Access Rules

Address

Read

Write

014h

Always

Conditional

RLVD

TKPASS

TKCAPT

CBERR

DUPTKR

TRTEXP

TVXEXP

ENTRMD

Bit

Symbol

Description

RLVD

Ring Latency Valid

0 This bit is set to Zero to request a new latency value from the Ring Engine The Ring Latency count is set

to zero before each measurement

1 This bit is set to One when the Ring Latency measurement is complete

This bit is written unconditionally and is not protected by the Compare Register Note that if a duplicate of this

station’s MAC address exisits on the ring the Ring Latency Measurement will not complete The Ring Engine

will restart the Ring Latency Measurement on each early Token arrival

TKPASS

Token Passed

Indicates that a valid token has been passed (without capturing it) or has been issued after a

service opportunity

TKCAPT

Token Captured

Indicates that a token has been captured

CBERR

Claim andor Beacon Error

Indicates that the Claim andor Beacon Process failed because TRT expired

while the Transmitter was in the Claim or Beacon state

DUPTKR

Duplicate Token Received

Indicates that a valid token was received while the Transmitter was in the

Transmit Data or Issue Token state

TRTEXP

TRT Expired

Indicates that a valid token was not received within 2 TNEG

TVXEXP

TVX Expired

Indicates that a valid frame or token was not received in TVX time

ENTRMD

Enter Restricted Mode

Indicates that a Restricted Token was received and that the R

Flag transitions

from0to1

DP83266 Datasheet(PDF) 64 Page - National Semiconductor (TI)

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