mt9079apr1 Zarlink Semiconductor, mt9079apr1 Datasheet - Page 48

• Manufacturer Part Number: mt9079apr1
• Description: Advanced Controller For E1
• Manufacturer: Zarlink Semiconductor

Status Page 4
Tables 59 to 66 describe the bit functions of the page 4 status registers and counters. The Internal Vector Status
Word is cleared automatically after it is read by the microprocessor. The RESET and RST functions do not affect
the page 4 counters. Therefore, individual counters must be initialized to a starting value by a write operation or a
counter load operation (Table 43) in ST-BUS control mode. When presetting or clearing the BPV counter, BPV7-
BPV0 should be written to first, and BPV15-BPV8 should be written to last.
7 - 0
7 - 0
Bit
Bit
Bit
7
6
5
4
3
2
1
0
CRCS1
CRCS2
AIS16S
Name
Name
RFAIL
RCRS
Name
LOSS
AISS
RAIS
BR7
BR0
IV7
IV0
-
-
Bit Error Rate Counter. An eight bit counter that contains the total number of bit errors
received in a specific time slot. See the
Interrupt Vector Bits 7 to 0. The interrupt vector status word contains an interrupt vector that
indicates the category of the last interrupt. See the section on interrupts.
Receive CRC Error Status One. If one, the evaluation of the last received submultiframe
one resulted in an error. If zero, the last submultiframe one was error free. Updated on a
submultiframe one basis.
Receive CRC Error Status Two. If one, the evaluation of the last received submultiframe two
resulted in an error. If zero, the last submultiframe two was error free. Updated on a submul-
tiframe two basis.
Remote CRC-4 Multiframe Generator/detector Failure. If one, each of the previous five sec-
onds have an E-bit error count of greater than 989, and for this same period the receive RAI
bit was zero (no remote alarm), and for the same period the SYNC bit was equal to zero
(basic frame alignment has been maintained). If zero, indicates normal operation.
Loss of Signal Status Indication. If one, indicates the presence of a loss of signal condition.
If zero, indicates normal operation. A loss of signal condition occurs when there is an
absence of the receive PCM 30 signal for 255 contiguous pulse (bit) positions from the last
received pulse. A loss of signal condition terminates when an average ones density of at
least 12.5% has been received over a period of 255 contiguous pulse positions starting with
a pulse.
Alarm Indication Signal 16 Status. If one, indicates an all ones alarm is being received in
channel 16. If zero, normal operation. Updated on a frame basis.
Alarm Indication Status Signal. If one, indicates that a valid AIS or all ones signal is being
received. If zero, indicates that a valid AIS signal is not being received. The criteria for AIS
detection is determined by the control bit ASEL.
Remote Alarm Indication Status. If one, there is currently a remote alarm condition. If zero,
normal operation. Updated on a non-frame alignment frame basis.
RAI and Continuous CRC Error Status. If one, there is currently an RAI and continuous
CRC error condition. If zero, normal operation. Updated on a submultiframe basis.
Table 59 - Interrupt Vector Status Word
Table 58 - Alarm Status Word One
(Page 3, Address 19H) (continued)
Table 60 - Bit Error Rate Counter
(Page 4, Address 18H)
(Page 4, Address 12H)
Zarlink Semiconductor Inc.
MT9079
48
Functional Description
Functional Description
Functional Description
BFAS
control bit function of page 1, address 1AH.
Data Sheet