dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 36

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

Bit
D0
D1
D2
D3
D4
D5
D6
D7
6 0 Control Information
Ring Event Latch Register (RELR0)
The Ring Event Latch Register 0 (RELR0) captures conditions that occur on the Ring including the receipt of Beacon and Claim
frames transitions in the Ring Operational flag and the receipt of duplicate addresses Each bit may be masked via the Ring
Event Mask Register 0 (REMR0)
ACCESS RULES
REGISTER BITS
RES
D7
Address
ROP
RNOP
BCNR
CLMR
OTRMAC
PINV
DUPADD
RES
Symbol
10h
DUPADD
D6
Ring Operational Set Is set when the Local Ring Operational flag transitions from 0 to 1
Ring Non-Operational Set Is set when the Local Ring Operational flag transitions from 1 to 0
Beacon Frame Received Indicates that a valid Beacon frame was received When set restricted and
synchronous requests are not serviced The type of Beacon frame received is given in Register RELR1
Claim Frame Received Indicates that a valid Claim frame was received When set restricted requests are
not serviced The type of Claim frame received is given in Register RELR1
Other MAC Frame Received Indicates that a MAC frame other than a Beacon or Claim frame was received
When set restricted requests are not serviced
PHY Invalid Received Indicates that a PHY Invalid was received This could be the result of a PLAYER
device Reset operation
PHY Invalid causes the MAC Receiver to enter state R0 (Listen)
Duplicate Address Received Indicates that a valid individual frame addressed to this station was received
with the A indicator set This could be caused by either a MAC using the same address (duplicate address) or
a strip error at the Source (the frame was received twice)
Reserved
PINV
D5
Always
Read
OTRMAC
D4
(Continued)
Condition
CLMR
Write
D3
BCNR
D2
36
RNOP
D1
Description
ROP
D0