DP83261 datasheet(124/132 Pages) NSC

124 / 132 page

Appendix A Ring Engine State Machines (Continued)

5 ED

Actions

INC FRCT

Frame Received Ct

SIGNAL FR Received

EDRDVD

SET CILRFRRCV

If Valid Data Length

(Valid FCS Rc

l (FCr 4 Void) l

(FCr

4 Implementer and n(OptionIFCS))

THEN RESET TVX

IF (A Flag

l(EA

OptionEMIND))

VCOPY

THEN SET C Flag

ELSE SET E Flag

This E Flag is used during rest of the ED Actions

CLEAR A Flag

M Flag

H Flag

L Flag

IF Er i SE Flag

THEN INC EICT

Error Ct

SET CILRFREI

Frame Error Isolated

IF Er

4 R

nE Flag

THEN

IF FCr

4 Claim

THEN SET RELRCLM

IF A Flag

M Flag

THEN SIGNAL My Claim

SET RELRMYCLM

CLEAR R Flag

SET TNEG

4 T Bid Rc

IF H Flag

THEN SIGNAL Higher Claim

SET RELRHICLM

CLEAR R Flag

SET TNEG

4 T Bid Rc

IF L Flag

THEN SIGNAL Lower Claim

SET RELRLOCLM

CLEAR R Flag

IF FCr

4 Beacon

THEN SET RELRBCN

IF M Flag

THEN SIGNAL My Beacon

SET RELRMYBCN

CLEAR R Flag

IF n(M Flag

l E Flag)

THEN SIGNAL Other Beacon

SET RELROTRBCN

CLEAR R Flag

IF FCr

4 Other MAC

THEN SIGNAL Other MAC

SET RELROTRMAC

IF FCr

4 VOID

THEN

IF M Flag

A Flag

nDAIG

SIGNAL My Void

ELSE IF nA Flag

SIGNAL Void

ELSE IF nM Flag

SIGNAL Other Void

124

DP83261 Datasheet(PDF) 124 Page - National Semiconductor (TI)

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