dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 122

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

Appendix A Ring Engine State Machines
A 1 2 MAC RECEIVER FOOTNOTES
A1 2 1 Internal Conditions
(1) ESA
(2) ELA
(3) IRR
(4) IFCS
(5) EMIND
(6) MAC Reset
A 1 2 2 Transition Conditions
(1) PH Invalid
(2) PH Indication (S1 S2)
(3) Transition R(12)
A 1 2 3 Actions
1 DA Actions
Option Enable Short Address
Option Enable Long Address
Option Inhibit Recovery Required
Option Implementer FCS
Option External Matching Indicators
Function MAC Reset
See encoding of PH Invalid in Section 7 2 1 1
S1 is the first symbol received
PH
This Transition may be a 0 time transition from any state except R0 Listen
IF FC L 4 0 CLEAR FCSL
After DA0r
IF FCSL 4 0
IF FCSL 4 1
Indication in Section 7 2 1 1
ELSE SET FCSL
IF DA IG 4 0 CLEAR DAIG
After DA1r
After DA5r
IF DAIG 4 0
NOTE
ELSE SET DAIG
short address
long address
A Flag may be set on reception of VOID frames
SIGNAL DARCVD
IF DAIG
IF DAIG 4 0
SIGNAL DARCVD
IF DAIG 4 1
THEN IF DAr 4 MLA
THEN IF DAr is contained in set of Group Addresses
THEN IF DAr 4 MSA
THEN IF DAr is contained in set of Group Addresses
l
nMode Run
short address
long address
e
group address
1
THEN SET A Flag
THEN SET A Flag
THEN SET A Flag
THEN SET A Flag
l
S2 is the second symbol received
individual address
(nESA
nELA)
122
(Continued)
See encoding of