DP83261 datasheet(123/132 Pages) NSC

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Appendix A Ring Engine State Machines (Continued)

2 SA

Actions

IF FCSL

4 0 short address

After SA1r

SIGNAL SARCVD

IF ESA

THEN IF SAr

4 MSA

THEN SET MFLAG

Signal FR Strip

ELSE IF SAr l MSA THEN

SET HFLAG

ELSE SET LFLAG

IF ((SAr

4 previous SAr)

(previous FCSL

4 0)

(FCFF

4 nMAC

previous FCFF

4 nMAC) THEN

SIGNAL SAMESA

IF FCSL

4 1 long address

After SA5r

SIGNAL SARCVD

IF ELA

THEN IF SAr

4 MLA

THEN SET MFlag

Signal FR Strip

ELSE IF SAr l MLA

THEN SET H Flag

ELSE SET L Flag

IF ((SAr

4 previous SAr)

(previous FCSL

4 1)

(FCFF

4 nMAC

previous FCFF

4 nMAC)

THEN SIGNAL SAMESA

NOTE

A station with a null address may not win Claim when OptionIRR is set

3 CT

Actions

After 4 Info Octets

If FCr

4 Claim

IF T Bid Rc i TREQ

CLEAR MFLAG

IF T Bid Rc l TREQ

THEN IF L Flag

SET H Flag

CLEAR L Flag

ELSE IF H Flag

SET L Flag

CLEAR H Flag

IF L Flag

SIGNAL FR Strip

IF ((INFOr

4 previous INFO)

(FCSL

4 previous FCSL)

(FCFF

4 MAC

previous FCFF

4 MAC)

THEN SIGNAL SAMEINFO

4 TK

Received

Actions

IF Token Class

4 Restricted

THEN IF nR Flag

THEN SET R Flag

SET TELRENTRMD

Entered Restricted Mode

ELSE RESET TVX

CLEAR R Flag

SIGNAL TK Received

INC TKCT

token count

SET CILRTKRCVD

Token Received

123

DP83261 Datasheet(PDF) 123 Page - National Semiconductor (TI)

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