dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 128

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

Appendix A Ring Engine State Machines
(6) Another Void
(7) Reset Required
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
Note (Ring Operational
A 2 2 3 Transition Actions
(1) Pass Actions
(2) Capture Actions
(3) Immediate Actions
(4) Reset Actions
After FSx
MAC Reset
(nIRPT
(IRPT
Claim Request
(nIRR
(Lower Claim
(TRT expires
CLEAR TX Ready
IF T1 THEN SET RbeginOK 4 nFCr L
SET TX Class 4 FCr L
If Ring Operational
CLEAR TX ED
SET TX Class 4 FCr L
RESET Lmax
IF nLate
CLEAR TX ED
SET TX Class 4 none
SET Early
IF T4
CLEAR TX Ready
SET TX Class 4 none
SET T Opr 4 T Max
IF Ring Operational
IF MAC Reset
l
T5
l
THEN SET TX Abort
THEN SET RELR Ring Operational Reset
CLEAR Late Count
(T3
THEN IF nLate
ELSE SET T Opr 4 T Neg
THEN SET Early
ELSE CLEAR Early
(T2
(Higher Claim
l
RESET TRT 4 T Opr
TX Pass
l
l
Ring Operational
l
TX Abort
TX Abort
(T0
nTX Ready
l
T Opr
My Beacon
Late
Void Strip
THEN RESET TRT 4 T Opr
ELSE CLEAR Late
SET RELR Ring Operational Set
TX Ack
k
RESET TRT 4 T Opr
(Ring Operational
T Req) must be detected by software
SET TX Ready
SET TX Pass
Void Strip
n((T0
SET TX Pass
SET TX Ready
TX Pass
TX Pass
l
SET THT 4 TRT
Void Strip
l
Other Beacon
Ring Operational
TVX expires
Late
nTX Pass
l
T1)
CLEAR Late
RESET TRT 4 T Opr
Void Strip
Void Strip
nVsent
TELR Token Passed
TK Received))))
TELR Token Captured
nTX ED)
l
l
l
SET Late
TX Class
RESET TRT 4 T Opr
Other MAC))
128
Function MAC Reset
Ring Operational
i
(Continued)
none
SET Late
l
l
nLate))))