MT9075B
Preliminary Information
Bit
Name
Functional Description
Bit
Name
Functional Description
7
EBI
(0)
Receive E-bit Interrupt. When
unmasked an interrupt is initiated
when a receive E-bit indicates a
0
SIGI
(0)
Signalling (CAS) Interrupt. When
unmasked and any of the receive
ABCD bits of any channel changes
state an interrupt is initiated. 1 -
unmasked, 0 - masked. Interrupt
vector = 00000001
remote
CRC-4
error.
1
-
unmasked, 0 - masked. Interrupt
vector = 00100000.
6
5
CRCI
(0)
CRC-4 Error Interrupt. When
unmasked an interrupt is initiated
when a local CRC-4 error occurs. 1
- unmasked, 0 - masked. Interrupt
vector = 00100000.
Table 23 - Interrupt Mask Word One
(Page 01H, Address 1CH)
Bit
Name
Functional Description
CEFI
(0)
Consecutively
Errored
FASs
7
EBOI
(0)
Receive E-bit Counter Overflow
Interrupt. When unmasked an
interrupt is initiated when the E-bit
Interrupt. When unmasked an
interrupt is initiated when two
consecutive
errored
frame
error counter overflows.
unmasked, 0 - masked. Interrupt
vector = 00010000.
1
-
alignment signals are received. 1 -
unmasked, 0 - masked. Interrupt
vector = 00100000.
6
5
4
CRCOI CRC-4 Error Counter Overflow
4
3
BPVI
(0)
Bipolar Violation Interrupt. When
unmasked an interrupt is initiated
Interrupt. When unmasked an
interrupt is initiated when the CRC-4
(0)
when
a
bipolar violation error
error counter overflows.
1
-
occurs. 1 - unmasked, 0 - masked.
Interrupt vector = 00100000.
unmasked, 0 - masked. Interrupt
vector = 00010000.
RCR0I RAI and Continuous CRC Error
CALNI CRC-4 Alignment Interrupt. When
Interrupt. When unmasked an
interrupt is initiated when the
received A bit has been one, and
the received E bits have been zero,
continuously for greater than 10
milliseconds (see page 04H,
address 19H) 1- unmasked, 0 -
(0)
unmasked an interrupt is initiated
when the CALN status bit of page
03H, address 12H changes state. 1
- unmasked, 0 - masked. Interrupt
vector = 00001000.
(0)
FEROI Frame Alignment Signal Error
masked.
Interrupt
vector
=
Counter Overflow Interrupt. When
unmasked an interrupt is initiated
when the frame alignment signal
(0)
00100000.
2
RCR1I RAI and Continuous CRC Error
error counter overflows.
1
-
Interrupt. When unmasked an
interrupt is initiated when the
received A bit had been set, and the
(0)
unmasked, 0 - masked. Interrupt
vector = 00010000.
received
E
bits
were
low,
3
JAI
(0)
Jitter
Attenuation
Interrupt.
continuously for greater than 10
milliseconds, but less than 450
milliseconds (see page 04H,
address 19H). 1 - unmasked, 0 -
masked.
00100000.
When unmasked, an interrupt will
be initiated when the jitter
attenuator FIFO comes within four
bytes of an overflow or underflow
condition.
masked.
Interrupt
vector
=
1
-
unmasked,
0
-
Interrupt vector
=
00000100.
1
BERI
(0)
Bit
Error
Interrupt.
When
unmasked an interrupt is initiated
when a bit error occurs. 1 -
unmasked, 0 - masked. Interrupt
vector = 00100000.
Table 24 - Interrupt Mask Word Two
(Page 01H, Address 1DH) (continued)
Table 23 - Interrupt Mask Word One
(Page 01H, Address 1CH) (continued)
36
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