dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 129

• Manufacturer Part Number: dp83261
• Description: Bmac Device Fddi Media Access Controller
• Manufacturer: National Semiconductor Corporation

Appendix A Ring Engine State Machines
(5) Recovery Actions
(6) Start Actions
(7) Issue Actions
A 2 2 4 State Actions
(1) TRT Actions
(2) RLCT Actions
(3) TX Idle Actions (T0)
IF T2
IF T5
CLEAR TX Ready
SET TX Class 4 nonrestricted
SET T Opr 4 T Max
IF Ring Operational
CLEAR TX Ready
RESET TRT 4 T Opr
IF nRing Operational
IF TX Class 4 nonrestricted
Always
Always
Always
THEN CLEAR Void Strip
THEN SET TX Abort
THEN CLEAR TX Abort
THEN SET RELR Ring Operational Reset
THEN SET T Opr 4 T Neg
THEN SET RbeginOK
ELSE CLEAR RbeginOK
IF TRT expires
IF TELR Ring Latency Valid
PH Data request(II)
IF My Void
nTX Ready
(TRT expires
Lower Claim
Other Beacon
IF My Void
CLEAR Late Count
THEN RESET TRT 4 T Opr
THEN DISABLE Latency Count
THEN SET TELR Ring Latency Valid
TX Ack
TX Ack
l
Other Void
RESET TRT 4 T Opr
nTX Pass
IF n((T0
IF (T4
l
My Beacon
l
Other MAC
Latency Count enabled
Void Strip
TX Abort
(T5
Late)
THEN SET TELR Recovery Failed
l
THEN IF nLate
SET TX Pass
nR Flag
T1)
n(My Claim
n(My Beacon
l
PH Invalid
l
nTX ED
Ring Operational
RESET TRT 4 T Opr
Higher Claim
l
TK Received
l
SET Void Strip
MAC Reset
TK Received
THEN SET Late
ELSE SET TELR TRT Expired
SET Late
l
IF nRing Operational
l
129
(nESA
l
l
nITR
Other Void
(Claim Request
(Continued)
TX Pass
nIRPT)
SET Late
THEN INCREMENT Late Count
nIRPT))
nELA)
l
l
l
nIRR)))