DP83261AVF datasheet(80/132 Pages) NSC

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70 Signal Descriptions (Continued)

7324 Termination Event

The terminating event for all PDUs is provided in the PDU Status signals

When a token is terminated by a valid Ending Delimiter (TT symbol pair) the TKRCVD signal is asserted When a frame is

terminated by a valid Ending Delimiter the EDRCVD is asserted and remains asserted until all frame status has been passed to

the MA

Indicate Interface Every PDU is terminated by one of the following

1 A valid Ending Delimiter (TKRCVD or EDRCVD)

2 An IDLE symbol indicating that the frame was stripped by another station (FRSTRP)

3 A symbol other than data Idle or an Ending Delimiter indicating that a Format Error occurred (FOERROR)

4 A MAC Reset (MACRST)

Symbol

Description

TKRCVD

Token Received

Indicates that the Ending Delimiter for a valid token is being received

EDRCVD

Ending Delimiter Received

Indicates that the Ending Delimiter for a frame is being received The

values of the received Status Indicators are available through the MID byte stream on this and

subsequent cycles while this signal is asserted

FRSTRP

Frame Stripped

Indicates that an Idle symbol was received while expecting part of a PDU This

usually indicates that the PDU was stripped by an upstream station This signal may be asserted

anytime during reception of a frame after RCSTART is asserted

FOERROR

Format Error

Indicates that a Format Error (non-DATA IDLE or Ending Delimiter Symbol) was

detected This signal may be asserted anytime during reception of a frame including with RCSTART

for the next frame

MACRST

MAC Reset

Indicates that a MAC Reset has been issued This signal is asserted as a result of a

software or hardware reset or internal errors This signal is asserted whenever bit MCRST of the

Function Register is set This signal may be asserted anytime

7325 Termination Status

When a valid Ending delimiter is received after a valid starting delimiter the termination status signals provided the results of the

Frame validity check and the Frame Check Sequence Check

The received values of the control indicators are presented in the data stream while EDRCVD is asserted

Symbol

Description

VDL

Valid Data Length

Indicates that a frame meeting the minimum length requirements of the Standard

and of an even number of symbols was received This signal is valid with EDRCVD

VFCS

Valid Frame Check Sequence

Indicates that a frame with the standard CRC was received This signal

is valid with EDRCVD

DP83261AVF Datasheet(PDF) 80 Page - National Semiconductor (TI)

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