Advance Information
MT9074
Bit
Name
Functional Description
Bit
Name
Functional Description
Unused.
1
BIOMI
Bit Oriented Message Interrupt.
When unmasked this interrupt bit
goes high whenever a pattern
111111110xxxxxx0 has been
received on the FDL that is
different from the last message.
The new message must persist for
7
6
- - -
HDLC0I HDLC0 Interrupt. Whenever an
unmasked HDLC0 interrupt occurs
(from the 4 kHz data link) this bit
goes high. Reading this register
clears this bit.
8
out the last 10 message
5
4
HDLC1I HDLC1 Interrupt. Whenever an
unmasked HDLC1 interrupt occurs
(from the DS1 channel 24
signalling channel) this bit goes
high. Reading this register clears
this bit.
positions to be accepted as a valid
new message. Reading this
register clears this bit.
0
SIGI
Signalling
Interrupt.
When
unmasked this interrupt bit goes
high whenever a change of state
(optionally debounced - see DBEn
in the Data Link, Signalling Control
Word page 1 address 12H) is
detected in the signalling bits (AB
or ABCD) pattern. Reading this
register clears this bit.
LCDI
Loop Code Detected Interrupt.
When unmasked this interrupt bit
goes high whenever either the
loop up (00001) or loop down
(001) code has been detected on
the line for
a period of 48
milliseconds. Reading this register
clears this bit.
Table 69 - Interrupt Word Three
(Page 4, Address 1EH) (T1)
3
2
1SECI
5SECI
One Second Status Interrupt.
When unmasked this interrupt bit
goes high whenever the 1SEC
status bit (page 3 address 12H bit
7) goes from low to high. Reading
this register clears this bit.
Five Second Status Interrupt.
When unmasked this interrupt bit
goes high whenever the 5 SEC
status bit goes from low to high.
Reading this register clears this
bit.
Table 69 - Interrupt Word Three
(Page 4, Address 1EH) (T1)
63
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