MT9075A
Preliminary Information
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.
Interrupt
Category and
Vector
Interrupt Description
SYNI - Loss of Synchronization.
MFSYI - Loss of Multiframe Sync.
CSYNI - Loss of CRC-4 Sync.
YI - Remote Multiframe Sync. Fail.
Synchroniza-
tion
D7
D0
10000000
RAII - Remote Alarm Indication.
AISI - Alarm Indication Signal.
AIS16I - AIS on Channel 16.
LOSI - Loss of Signal.
Alarm
D7
D0
01000000
AUXPI - Auxiliary Pattern.
EBI - Receive E-bit Error.
CRCI - CRC-4 Error.
CEFI - Consecutive Errored FASs.
FERI - Frame Alignment Signal
Error.
Counter
Indication
D7
D0
00100000
BPVI - Bipolar Violation Error.
RCR0 - RAI and CRC Error Active.
RCR1 - RAI and CRC Error End.
BERI - Bit Error.
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 - MT9075A Interrupt Vectors
(IV7 - IV0)
4-156
MITEL [ MITEL NETWORKS CORPORATION ]
