MT9072AB datasheet(172/275 Pages) ZARLINK

172 / 275 page

MT9072

Data Sheet

172

Zarlink Semiconductor Inc.

ARAI

(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).

TALM

(0)

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).

TAIS

(0)

Transmit Alarm Indication Signal. If one, an all ones signal is transmitted in all timeslots except

zero and 16. If zero, timeslots function normally.

TAIS0

(0)

Transmit AIS Timeslot Zero. If one, an all ones signal is transmitted in timeslot zero. If zero,

timeslot zero functions normally.

9TAI16

(0)

Transmit AIS Timeslot 16. If one, an all ones signal is transmitted in timeslot 16. If zero, timeslot

functions normally.

8TE

(0)

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.

7TIU0

(0)

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.

6TIU1

(1)

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.

5CSYN

(0)

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.

4REFRM

(0)

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.

Bit Name

Functional Description

Table 142 - Alarm and Framing Control Register Y00 (R/W Address Y00) (E1)

MT9072AB Datasheet(PDF) 172 Page - Zarlink Semiconductor Inc

MT9072AB Datasheet(HTML) 172 Page - Zarlink Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL