DP83261AVF datasheet(94/132 Pages) NSC

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70 Signal Descriptions (Continued)

Transmission Status

Symbol

Description

TXED

Transmitted Ending Delimiter

Indicates that the Transmitter completed transmission of the current

or previous PDU TXED is asserted when the current PHY Request byte is a transmitted (not

repeated) Ending Delimiter It remains asserted until the beginning of either the next transmitted (not

repeated) PDU or the next Service Opportunity TXED is cleared by the Master Reset (bit MARST of

the Function Register)

TXABORT

Transmission Aborted

Indicates that the Transmitter aborted transmission of the current or

previous PDU before the Ending Delimiter or that the current Service Opportunity was aborted by

Reset or Recovery actions TXABORT is asserted when the current transmitted (not repeated) PDU

has been aborted and remains valid until the end of the transmitted Void frame

TXABORT is cleared by Master Reset (bit MARST of the Function Register) It is also cleared when

an Immediate Claim or Beacon Service Opportunity is terminated by My

Claim or My

Beacon

received (ie when transition T(47) or T(54) occurs during an Immediate Service Opportunity)

TXRINGOP

Ring Operational

Indicates the current value of the Ring

Operational flag

TXCLASS

Token Class

Indicates the class of the current or previous token in the Transmitter TXCLASS is set

to R

Flag when a valid token is received TXCLASS is set to the Issue Token Class when the

RQRDY and RQFINAL signals are asserted (before Token FC time) for the current Service

Opportunity It is cleared by Reset and Recovery actions

THTDIS

Token Holding Timer Disabled

Indicates that the Token Holding Timer was disabled when the

current PHY Request byte was generated THTDIS only changes between frames When either signal

TXRDY or TXPASS is asserted after a frame THTDIS reflects the THT usage for that frame for at

least two byte times When TXPASS is asserted while THTDIS is asserted it indicates that TRT

expired

DP83261AVF Datasheet(PDF) 94 Page - National Semiconductor (TI)