MT9074
Advance Information
Bit
Name
Functional Description
Bit
Name
Functional Description
2
EXTOSC External Oscillator Select.
Setting this bit connects the pin
OSC1 to a TTL compatible input.
This allows for a system design
employing a TTL output oscillator
as a 20.000 Mhz reference clock.
2
SEFIM
Severely
Interrupt
unmasked an interrupt is
initiated when a sequence of 2
framing errors out of 6 occurs. If
1 - unmasked, 0 - masked.
Errored
Mask.
Frame
When
1
0
RSV
Reserved. Set to zero for normal
operation.
1
0
TxSLPIM
Transmit SLIP Interrupt Mask.
When unmasked an interrupt is
initiated whenever a controlled
frame slip occurs in the transmit
elastic buffer. If 1 - unmasked, 0
- masked.
RSV
Reserved. Set to zero for normal
operation.
Table 31 - Reset Control Word (T1)
(Page 1, Address 1AH)
RxSLPIM Receive SLIP Interrupt Mask.
When unmasked an interrupt is
initiated whenever a controlled
frame slip occurs in the receive
elastic buffer. If 1 - unmasked, 0
- masked.
Bit
Name
Functional Description
7
TFSYNIM Terminal
Frame
Synchronization
Interrupt
Mask. When unmasked an
interrupt is initiated whenever
a change of state of terminal
frame synchronization condition
exists. If 1 - unmasked, 0 -
masked.
Table 32 - Interrupt Mask Word Zero (T1)
(Page 1, Address 1BH)
Bit
Name
Functional Description
6
MFSYNIM Multiframe
Interrupt
Synchronization
Mask. When
7
FEIM
Framing Bit Error Interrupt
Mask. When unmasked an
interrupt is initiated whenever an
erroneous framing bit is detected
(provided the circuit is in terminal
frame sync). If 1 - unmasked, 0 -
masked.
unmasked an interrupt is
initiated whenever a change of
state
of
multiframe
synchronization condition exist.
If 1 - unmasked, 0 - masked.
5
4
- - -
Unused.
6
5
4
CRCIM
YELIM
CRC-6 Error Interrupt Mask.
When unmasked an interrupt is
initiated whenever a local CRC-6
error occurs. If 1 - unmasked, 0 -
masked.
AISIM
Alarm
Interrupt
unmasked a change of state of
received all ones condition will
initiate an interrupt. If
unmasked, 0 - masked.
Indication
Mask.
Signal
When
1 -
Yellow Alarm Interrupt Mask.
When unmasked detection of a
3
LOSIM
Loss of Signal Interrupt Mask.
When unmasked an interrupt is
initiated whenever a change of
state of loss of signal condition
exists. If 1 - unmasked, 0 -
yellow
alarm
triggers
an
interrupt. If 1 - unmasked, 0 -
masked.
COFAIM Change of Frame Alignment
Interrupt Mask. When
masked. Interrupt vector
01000000.
=
unmasked an interrupt is initiated
whenever a change of frame
alignment occurs after a reframe.
If 1 - unmasked, 0 - masked.
Table 32 - Interrupt Mask Word Zero (T1)
(Page 1, Address 1BH)
Table 33 - Interrupt Mask Word One (T1)
(Page 1, Address 1CH
48
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