MT9072AB datasheet(82/275 Pages) ZARLINK

82 / 275 page

MT9072

Data Sheet

Zarlink Semiconductor Inc.

10.1.7

Multiframe Boundary (RxMF, TxMF Pins)

Dedicated multiframe boundary pins are included which provide the user the option of setting the multiframe

boundaries and identifying the multiframe boundaries with an external device. Refer to the RxMF and TxMF pin

descriptions for more details.

11.0

ST-BUS Analyzer

The ST-BUS Analyzer is a powerful system diagnostic and debugging tool. The ST-BUS Analyzer allows for the

capture of any ST-BUS data stream or channel to a 32 byte memory. The ST-BUS Analyzer can capture a single

frame of data or 32 samples of a specified channel from DSTi, DSTo, CSTi or CSTo from any one of the 8 framers.

The analysis can be performed continuously or on a single shot basis where 32 bytes are captured and then the

analysis is suspended. An optional interrupt can be generated when a single shot analysis is complete. The

operation of the ST-BUS analyzer is controlled by Global Control Register 1 (901).

12.0

Loopbacks

12.1

T1 Loopbacks

In order to meet PRI Layer 1 requirements and to assist in circuit fault sectionalization, the MT9072 has 7 loopback

functions.

The control bits for digital, remote, ST-BUS and payload loopbacks are located at address Y05. The remote and

local timeslot loopbacks are controlled through control bits of the Timeslot Control register located at addresses

Y90-YA7.

a) Digital loopback (DG Loop) - DSTi to DSTo at the PCM24 side. Bit DLBK = 0 normal; DLBK = 1 activate.

b) Payload loopback (PL Loop) - Payload loopback (DSTo to DSTi). Bit PLBK = 0 normal; PLBK = 1 activate. The

payload loopback is effectively a physical connection of DSTo to DSTi within the framer.

Note: Set RxDO (YF1 bit 9 to 1) to obtain correct data at the Tx.

c) Local and Remote Timeslot Loopback. Remote timeslot loopback control bit RTSL = 0 normal; RTSL = 1 activate

(Register Y90-YA7) will loop around transmit ST-BUS timeslots to the DSTo stream. Local timeslot loopback bits

LTSL = 0 normal; LTSL = 1 activate(Register Y90-YA7), will loop around receive PCM24 timeslots towards the

remote PCM24 end.

MT9072

DSTi

DSTo

System

PCM24

MT9072

DSTi

DSTo

System

PCM24

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