DP83261 datasheet(128/132 Pages) NSC

128 / 132 page

Appendix A Ring Engine State Machines (Continued)

(6) Another

Void

After FSx

TXPass

Void Strip

nVsent

(7) Reset

Required

MAC Reset

(nIRPT

(Higher Claim

l Other Beacon l Other MAC)) l

(IRPT

(T3

l (T0

(Ring Operational

l TXClass i none l nLate))))

Note

Any other MAC frame received while RING

Operational must be a My

Claim or a bad frame These frames are ignored here

(8) Recovery

Required

Claim Request

(nIRR

(Lower Claim

l My Beacon l TVX expires l

(TRT expires

Late

n((T0 l T1)TK Received))))

Note

(Ring

Operational

Opr k T

Req) must be detected by software

A223 Transition Actions

(1) Pass

Actions

CLEAR TXReady

Void Strip

IF T1 THEN SET RbeginOK

4 nFCrL

SET TXClass

4 FCrL SET TXPass TELRToken Passed

If Ring Operational

THEN IF nLate

THEN RESET TRT

4 T Opr

ELSE CLEAR Late

ELSE SET T Opr

4 T Neg RESET TRT 4 T Opr SET Late

SET RELRRing Operational Set

Ring Operational

(2) Capture

Actions

CLEAR TXED

TXAbort

TXPass

Void Strip

SET TXClass

4 FCrL SET TXReady TELRToken Captured

RESET Lmax

IF nLate

THEN SET Early

SET THT

4 TRT RESET TRT 4 T Opr

ELSE CLEAR Early

Late

(3) Immediate

Actions

CLEAR TXED

TXAbort

TXPass

Void Strip

SET TXClass

4 none SET TXReady

SET Early

RESET TRT

4 T Opr CLEAR Late

(4) Reset

Actions

IF T4

lT5l(T2

nTXReady

nTXPass

nTXED)

THEN SET TXAbort

CLEAR TXReady

TXAck

Void Strip

SET TXClass

4 none SET TXPass

SET T Opr

4 T Max RESET TRT 4 T Opr SET Late

IF Ring Operational

THEN SET RELRRing Operational Reset

IF MAC Reset

lRing Operational

CLEAR Late Count

Ring Operational

FunctionMAC Reset

128

DP83261 Datasheet(PDF) 128 Page - National Semiconductor (TI)

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