MT9075B
Preliminary Information
HDLC Interrupt Masks (page 0BH&0CH, address 16H)
Interrupt
Category and
Vector
Bit 7
Bit 0
Interrupt Description
Ga
EOPD TEOP EopR
TxFl FATxU RxFf RxOv
SYNI - Loss of Synchronization.
MFSYI - Loss of Multiframe Sync.
CSYNI - Loss of CRC-4 Sync.
YI - Remote Multiframe Sync. Fail.
Synchronization
After a device reset (RESET pin or RST control bit),
interrupts from the following interrupt mask words
are masked:
D7
D0
10000000
•
•
•
National use bit interrupt mask word
Interrupt mask words one through three.
HDLC interrupt mask word.
RAII - Remote Alarm Indication.
AISI - Alarm Indication Signal.
AIS16I - AIS on Channel 16.
LOSI - Loss of Signal.
Alarm
D7
D0
01000000
and the interrupts of mask word zero are unmasked.
AUXPI - Auxiliary Pattern.
EBI - Receive E-bit Error.
CRCI - CRC-4 Error.
CEFI - Consecutive Errored FASs.
FERI - Frame Alignment Signal
Error.
BPVI - Bipolar Violation Error.
RCR0 - RAI and CRC Error Active.
RCR1 - RAI and CRC Error End.
BERI - Bit Error.
Counter
All interrupts may be suspended, without changing
the interrupt mask words, by making the SPND
control bit (page 01H, address 1AH) high. Also,
when pin TAIS is held low, all interrupts are
suspended automatically. This allows for system
initialization without spurious interrupts.
Indication
D7
D0
00100000
EBO - Receive E-bit Error.
CRCO - CRC-4 Error.
FERO - Frame Alignment Signal.
BPVO - Bipolar Violation.
BERO - Bit Error.
Counter
Overflow
D7
D0
00010000
CMFO - CRC-4 Multiframe.
1SECI - One Second Timer.
CALNI - CRC-4 Multiframe
Alignment.
One Second
D7
D0
00001000
T1I - Timer T1 expires.
T2I - Timer T2 expires.
SLPI - Receive Slip.
JAI - Jitter Attenuator Error.
SLIP
D7
D0
00000100
PRBSO-PRBS Error Counter
Overflow
PRBSI - PRBS Single Error
National Use/
HDLC0
D7
D0
00000010
SanibI - Changed Sa5,6,7 or 8 Nibble
SabitI - Changed Sa5,6,7 or 8 Bits
C8SA6I- Sequence of 8 Sa6
nibbles.
SA6I - Changed Sa6 nibbles.
SA5I - Changed Sa5 bits.
HDLC0 - Status
SIGI-Receive Signalling Bit
Change.
HDLC1 - Status.
Signalling/
HDLC1
D7
00000001
D0
Table 11 - MT9075B Interrupt Vectors
(IV7 - IV0)
28
MITEL [ MITEL NETWORKS CORPORATION ]
