dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 46

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

D0
D1
D2
D3
D4 – 7
6 0 Control Information
Internal Event Latch Register (IELR)
The Internal Event Latch Register (IELR) reports internal errors in the BMAC device These errors include MAC Parity errors and
inconsistencies in the Receiver and Transmitter state machines
After an internal state machine is detected and reported (bit RSMERR for the receiver and TSMERR for the transmitter) the
Current Receive Status Register (CRS0) and Current Transmit Status Register (CTS0) continue to be updated as normal
Errors internal to the BMAC device cause a MAC Reset
ACCESS RULES
REGISTER BITS
Bit
RES
D7
Address
28h
MPE
RES
RSMERR
TSMERR
RES
Symbol
RES
D6
RES
D5
MAC Interface Parity Error Indicates a Parity Error on the MAC Request Data pins (MRD7 – 0) when
parity is enabled on the MA Request Interface (bits MRP of the Mode Register is set and pin TXACK is
asserted)
Reserved
Receive State Machine Error Indicates inconsistency in the Receiver state machine When set causes
bit MCRST of the Function Register to be set
Transmit State Machine Error Indicates inconsistency in the Transmitter state machine When set
causes bit MCRST of the Function Register to be set
Reserved
Always
Read
RES
D4
TSMERR
(Continued)
D3
Condition
Write
RSMERR
D2
46
RES
D1
Description
MPE
D0