mt9072av2 Zarlink Semiconductor, mt9072av2 Datasheet - Page 87

• Manufacturer Part Number: mt9072av2
• Description: Octal T1/e1/j1 Framer
• Manufacturer: Zarlink Semiconductor

13.0
13.1
The MT9072 has nine error counters for each framer, which can be used for maintenance testing and ongoing
measurement of the quality of a DS1 link and to assist the designer in meeting specifications such as TR62411 and
T1.403. All counters can be preset or cleared by writing to the appropriate counter registers.
Associated with each counter is a maskable event occurrence interrupt and a maskable counter overflow interrupt.
Overflow interrupts are useful when cumulative error counts are being recorded. For example, every time the
framing bit error counter overflow interrupt (FEO) occurs, 65536 frame errors have been received since the last
FEO interrupt. Also if a counter overflows, the overflow indicators are latched in the Overflow reporting latch
register(Y24).
All counters are cleared by a counter clear bit -CNTCLR - low to high transition (bit 2 of the IO Control Word, YF1).
An alternative approach to event reporting is to mask error events and to enable the 1 second sample bit (SAMPLE
- bit 1 of the Interrupt and IO Control Word). When this bit is set the latched version of the counters(Y28 to Y2C) for
change of frame alignment, loss of frame alignment, bpv errors, crc errors, errored framing bits, and multiframes out
of sync are updated on one second intervals coincident with the maskable one second interrupt timer.
PRBS Error Counter
and CRC Multiframe
counter for PRBS
Multiframe Out of
Frame Counter
Framing Bit Error
Counter
BPV Counter
CRC-6 Error counter
Out of frame counter,
change of frame
alignment counter
Excessive Zero
counter
Description
T1 Error Counters
Performance Monitoring
Counter
COFA7-0
BPV15-0
OOF7-0,
EXZ7-0,
PSM7-0
MFOOF
CC15-0
FC15-0
PS7-0,
Bits
7-0
Address Indication
Table 41 - Error Counters Summary (T1)
Y1A
Y1B
Y15
Y16
Y17
Y18
Y19
Zarlink Semiconductor Inc.
MFOOFI
Interrupt Status Bits
OOFOI
PRBSI
COFAI
CRCI
BPVI
FBEI
EXZI
MT9072
87
PRBSMFOI
MFOOFOI Multiframe Out of
Overflow
PRBSOI
COFOIL
CRCOI
OOFOI
EXZOL
BPVOI
FEOI
NA
Frame Count Latch
Framing Bit Error
Counter Latch
Bipolar Violation
Count Latch
CRC-6 Error Count
Latch
Out of Frame, Change
of Frame Alignment
Count Latch
NA
Description
1 Second Latch
FCL15-
COFAL
FL15-0
MFOO
CRCL
OOFL
BPVL
15-0
15-0
NA
7-0
7-0
NA
Bit
0
Data Sheet
Address
Y2C
Y2A
Y2B
Y28
Y29
NA
NA
.