MT9072 Zarlink Semiconductor, Inc., MT9072 Datasheet - Page 92

• Manufacturer Part Number: MT9072
• Description: Octal T1-E1-J1 Framer
• Manufacturer: Zarlink Semiconductor, Inc.

MT9072
13.2.7
The transmission of RAI and signaling multiframe alarms can be made to function automatically from control bits
ARAI and AUTY (register address Y00). When ARAI = 0 and basic frame synchronization is lost (BSYNC = 1
address Y10), the MT9072 will automatically transmit the RAI alarm signal to the far end of the link. The
transmission of this alarm signal will cease when basic frame alignment is acquired.
When AUTY = 0 and signaling multiframe alignment is not acquired (MSYNC = 1 address Y10), the MT9072 will
automatically transmit the multiframe alarm (Y-bit) signal to the far end of the link. This transmission will cease
when signaling multiframe alignment is acquired.
14.0 Interrupts
The MT9072 has an extensive suite of interrupts consisting of 2 maskable interrupt vectors and 32 maskable
interrupt status registers as shown in Figure 9 and an ST-BUS Analyzer Interrupt. The set bits in the 2 interrupt
vectors identify which of the 32 interrupt status registers is responsible for the interrupt. Reading the
corresponding interrupt status registers identifies the exact source of the interrupt. Any set bit in the interrupt
vectors causes the IRQ pin to toggle low (providing the SPND bit is not set).
92
Remote Alarm Indication
Alarm Indication Signal
Alarm Indication Signal 100ms
Channel 16 Alarm Indication
Signal
Auxiliary Pattern
Loss of Signal
Remote signaling Multiframe
Alarm
T1 Timer
T2 Timer
E1 Automatic Alarms
Description
Table 49 - Alarms and Timers Status Registers (E1)
AIS16
AUXP
LOSS
KLVE
RAI
AIS
Bit
T1
T2
Y
Register
Status
Add.
Y12
Y12
Y12
Y12
Y12
Y12
Y12
Y11
Y11
AIS16L
AUXPL
LOSSL
Latched Status
RAIL
AISL
T1L
T2L
Bit
YL
Register
Add.
Y24
Y24
Y24
Y24
Y24
Y24
Y26
Y26
Interrupt Status
AIS16I
AUXPI
LOSSI
RAII
AISI
T1I
T2I
Bit
YI
Register
Advance Information
Add.
Y34
Y34
Y34
Y34
Y34
Y34
Y36
Y36
Persistent Status
LOSSP
RAIP
AISP
Bit
Register
Add.
Y27
Y27
Y27