dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 124

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dp83261

Manufacturer Part Number

dp83261

Description

Bmac Device Fddi Media Access Controller

Manufacturer

National Semiconductor Corporation

Datasheet

1.DP83261.pdf (132 pages)

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Appendix A Ring Engine State Machines

5 ED Actions

INC FRCT

SIGNAL FR Received

SET CILR FRRCV

IF Er

IF Er 4 R

i

If Valid Data Length

(FCr 4 Implementer and n(Option IFCS))

THEN RESET TVX

IF (A Flag

THEN INC EICT

S

Frame Received Ct

nE Flag

E Flag

THEN SET C Flag

ELSE SET E Flag

CLEAR A Flag

SET CILR FREI

THEN

l

(EA

EDRDVD

IF FCr 4 Claim

IF FCr 4 Beacon

IF FCr 4 Other MAC

IF FCr 4 VOID

Error Ct

Option EMIND))

M Flag

Frame Error Isolated

(Valid FCS Rc

THEN SET RELR CLM

THEN SET RELR BCN

THEN SIGNAL Other MAC

SET RELR OTRMAC

THEN

This E Flag is used during rest of the ED Actions

IF A Flag

IF H Flag

IF L Flag

IF M Flag

IF n(M Flag

IF M Flag

ELSE IF nA Flag

ELSE IF nM Flag

H Flag

VCOPY

124

THEN SIGNAL My Claim

THEN SIGNAL Higher Claim

THEN SIGNAL Lower Claim

THEN SIGNAL My Beacon

SET RELR MYBCN

CLEAR R Flag

THEN SIGNAL Other Beacon

SET RELR OTRBCN

CLEAR R Flag

SIGNAL My Void

SIGNAL Void

SIGNAL Other Void

l

L Flag

(FCr 4 Void)

M Flag

A Flag

l

(Continued)

E Flag)

SET RELR MYCLM

CLEAR R Flag

SET TNEG 4 T Bid Rc

SET RELR HICLM

CLEAR R Flag

SET TNEG 4 T Bid Rc

SET RELR LOCLM

CLEAR R Flag

nDAIG

l

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