Advance Information
MT9074
Bit
Name
Functional Description
Bit Name
Functional Description
7
TFSYNI Terminal Frame Synchronization
Interrupt. When unmasked this
interrupt bit goes high whenever a
change of state of terminal frame
synchronization condition exists.
Reading this register clears this bit.
7
FEI Framing Bit Error Interrupt. When
unmasked this interrupt bit goes high
whenever an erroneous framing bit is
detected (provided the circuit is in
terminal frame sync). Reading this
register clears this bit.
6
MFSYNI Multiframe
Synchronization
6
5
4
CRCI CRC-6
Error
Interrupt.
When
Interrupt. When unmasked this
interrupt bit goes high whenever a
change of state of multiframe
synchronization condition exists.
Reading this register clears this bit.
unmasked this interrupt bit goes high
whenever a local CRC-6 error occurs.
Reading this register clears this bit.
YELI Yellow Alarm Interrupt. When
unmasked this interrupt bit goes high
upon detection of a yellow alarm.
Reading this register clears this bit.
5
4
- - -
Unused.
AISI
Alarm Indication Signal Interrupt.
When unmasked this interrupt bit
goes high whenever a change of
state of received all ones condition
exists. Reading this register clears
this bit.
COFAI Change
of
Frame
Alignment
Interrupt. When unmasked this
interrupt bit goes high whenever a
change of frame alignment occurs
after a reframe. Reading this register
clears this bit.
3
LOSI
Loss of Signal Interrupt. When
unmasked this interrupt bit goes
high whenever a change of state of
loss of signal (either analog - signal
40 dB below nominal or digital - 192
consecutive 0’s received) condition
exists. Reading this register clears
this bit.
3
2
1
BPVI Bipolar Violation Interrupt. When
unmasked this interrupt bit goes high
whenever
(excluding
encountered. Reading this register
clears this bit.
a
bipolar
violation
is
B8ZS encoding)
PRBSI Psuedo Random Bit Sequence
Error Interrupt. When unmasked this
interrupt bit goes high upon detection
of an error with a channel selected for
PRBS testing. Reading this register
clears this bit.
2
1
0
SEI
Severely Errored Frame Interrupt.
When unmasked this interrupt bit
goes high whenever a sequence of
2 framing errors out of 6 occurs.
Reading this register clears this bit.
TxSLPI Transmit SLIP Interrupt. When
unmasked this interrupt goes high
whenever a controlled frame slip
occurs in the transmit elastic buffer.
Reading this register clears this bit.
PDVI Pulse Density Violation Interrupt.
When unmasked this interrupt bit goes
high whenever in the absence of B8ZS
coding a sequence of 16 consecutive
zeros is received on the line, or the
incoming pulse density is less than N
ones in a time frame of 8(N+1) where
N = 1 to 23. In the case of B8ZS
coding, the interrupt is set upon
detection of 8 consecutive zeros.
Reading this register clears this bit.
RxSLPI Receive SLIP Interrupt. When
unmasked this interrupt bit goes
high whenever a controlled frame
slip occurs in the receive elastic
buffer. Reading this register clears
this bit.
0
- - - Unused.
Table 66 - Interrupt Word Zero
(Page 4, Address 1BH) (T1)
Table 67 - Interrupt Word One
(Page 4, Address 1CH) (T1)
61
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