mt9074ap1 Zarlink Semiconductor, mt9074ap1 Datasheet - Page 98

• Manufacturer Part Number: mt9074ap1
• Description: T1/e1/j1 Single Chip Transceiver With Wide Dynamic Range Liu
• Manufacturer: Zarlink Semiconductor

Bit
Bit
7
6
5
4
3
2
1
0
7
6
5
4
EXTOSC
CNTCLR
SAMPLE
MFSYIM
CSYNIM
SPND
Name
SYNIM
RSV
Name
AISIM
RST
INTA
- - -
Table 90 - Interrupt Mask Word Zero (E1)
Table 89 - Signaling Control Word (E1)
Reset. When this bit is changed from zero to one the device will reset to its
default mode. See the Reset Operation section for the default settings.
Suspend Interrupts. If one, the IRQ output (pin 12 in PLCC, 85 in MQFP)
will be in a high-impedance state and all interrupts will be ignored. If zero,
the IRQ output will function normally.
Interrupt Acknowledge. A zero-to-one or one-to-zero transition will clear
any pending interrupt and make IRQ high impedance.
Counter Clear. If one, all status counters are cleared and held low. Zero for
normal operation.
One Second Sample. Setting this bit causes the error counters (change of
frame alignment, loss of frame alignment, bpv errors, crc errors, severely
errored frame events and multiframes out of sync) to be updated on one
second intervals coincident with the one second timer (status page 3
address 12H bit 7).
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.
Reserved. Must be kept at 0 for normal operation.
Unused.
Synchronization Interrupt Mask. When unmasked (SYNI=1) an interrupt
is initiated whenever change of state of basic frame synchronization
condition exists. If 1 - unmasked, 0 - masked.
Multiframe
(MFSYI=1), an interrupt is initiated whenever a change of state of
multiframe synchro-nization is lost. If 1 - unmasked, 0 - masked.
CRC-4 Multiframe Synchronization Interrupt Mask. When unmasked
(CSYNI=1), an interrupt is initiated whenever a change of state of CRC-4
multiframe synchronization exists. If 1 - unmasked, 0 - masked.
Alarm Indication Signal Interrupt Mask. When unmasked (AISI=1) a
change of state of received AIS will initiate an interrupt. If 1 - unmasked, 0 -
masked.
(Page 1, Address 1AH)
(Page 1, Address 1BH)
Zarlink Semiconductor Inc.
MT9074
Synchronization
98
Functional Description
Functional Description
Interrupt
Mask.
When
Data Sheet
unmasked