mt9072av2 Zarlink Semiconductor, mt9072av2 Datasheet - Page 172

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

Bit
13
12
10
11
9
8
7
6
5
4 REFRM
CSYN
Name
TAIS0
TALM
TAI16
ARAI
TAIS
TIU0
TIU1
TE
(0)
(0)
(0)
(0)
(0)
(0)
(0)
(1)
(0)
(0)
Automatic Remote Alarm Indication (RAI) Operation. This bit determines the source for the
Remote Alarm Indication bit (the A bit) of the transmit PCM30 signal (time-slot 0 bit 3 of NFAS
frames). If zero, the source for the A bit is the RAI bit of the Timer and Alarm Status Register
(address Y11), and consequently, will change automatically. That is, A=0 when basic
synchronization has been acquired (RAI=0), and A=1 when basic synchronization has not been
acquired (RAI=1).
If the ARAI bit is set to one, the A bit is controlled through the TALM control bit (register address
Y00).
Transmit Remote Alarm. This bit is the source for the Remote Alarm Indication bit (the A bit) of
the transmit PCM30 signal (timeslot 0 bit 3 of NFAS frames) when the ARAI control bit (register
address Y00) is set to one. The TALM bit is used to signal an alarm to the remote end of the
PCM30 link (one - alarm, zero - normal).
Transmit Alarm Indication Signal. If one, an all ones signal is transmitted in all timeslots except
zero and 16. If zero, timeslots function normally.
Transmit AIS Timeslot Zero. If one, an all ones signal is transmitted in timeslot zero. If zero,
timeslot zero functions normally.
Transmit AIS Timeslot 16. If one, an all ones signal is transmitted in timeslot 16. If zero, timeslot
functions normally.
Transmit E bits. If zero, and CRC-4 synchronization is achieved, the PCM30 link E-bits transmit
the received CRC-4 comparison results to the distant end of the link, as per G.703. If zero, and
CRC-4 synchronization is lost, the E-bits transmit zero. If one, and CRC-4 synchronization is lost
the transmit E-bits will be one.
Transmit International Use Zero. This bit is transmitted on the PCM30 2048 kb/s link in bit
position one of time-slot 0 of all the frame-alignment signal (FAS) frames when CRC-4 operation is
disabled (CSYN=1 of register address Y00). The TIU0 bit is reserved for international use and
should normally be kept at one. If CRC-4 operation is enabled (CSYN=0), this bit is ignored.
Transmit International Use One. This bit is transmitted on the PCM 30 2048 kb/s link in bit
position one of timeslot 0 of all the Non-Frame Alignment Signal (NFAS) frames when CRC-4
operation is disabled (CSYN=1 of register address Y00). The TIU1 bit is reserved for international
use and should normally be kept at one. If CRC-4 operation is enabled (CSYN=0), this bit is
ignored.
CRC-4 Synchronization. The CSYN bit in combination with AUTC determines the enabling or
disabling of the CRC functions for timeslot 0. If one and AUTC (register address Y00) is one the
first bits of time-slot 0 for the transmitter are used as international use bits and are programmed by
the TIU0 and TIU1bits (register address Y00). If AUTC is a zero, the CRC-4 calculated bits are
inserted in the FAS frames as shown in Table 12. Also if AUTC is a one, the CSYN has to be low
for the CRC-4 bits to be inserted in the FAS frames. The transmit transparent bit overides the
function of this bit for the transmitter. On the receiver side, if AUTC is 1 and CSYN is 0 then more
than 914 CRC errors in 1 second will cause a resynchronization and search for a basic frame
synchronization. If AUTC is a 1 and CSYN is 1 than CRC errors are ignored. If AUTC is a zero
than more than 914 CRC errors in 1 second will result in basic frame reframe.
Reframe. A one-to-zero transition of this bit results in the execution of the reframing function (the
search for a new basic frame position). The basic frame alignment pattern is x0011011 in timeslot
0 of alternate frames.
Table 142 - Alarm and Framing Control Register Y00 (R/W Address Y00) (E1)
Zarlink Semiconductor Inc.
MT9072
Functional Description
172
Data Sheet