MT9072 Datasheet, PDF (82/275 Pages) Zarlink Semiconductor Inc – Octal T1/E1/J1 Framer

MT9072
Data Sheet
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.
DSTi
System
DSTo
MT9072
Tx
PCM24
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.
DSTi
System
DSTo
MT9072
Tx
Rx ^PCM24
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.
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Zarlink Semiconductor Inc.