MT9079 Mitel Semiconductor, MT9079 Datasheet - Page 26

• Manufacturer Part Number: MT9079
• Description: CMOS ST-BUS FAMILY Advanced Controller for E1
• Manufacturer: Mitel Semiconductor

MT9079
4-262
Bit
7
6
5
4
3
2
1
0
Table 26 - Mode Selection Control Word
Name
CRCM
MODE
AUTY
CSYN
AUTC
ARAI
TIU0
RST
(0)*
(0)
(0)
(0)
(0)
(0)
(0)
(0)
(Page 1, Address 11H)
Transmit International
When CRC-4 operation is disabled,
this bit is transmitted on the PCM 30
2048 kbit/sec. link in bit position one
of time-slot zero of frame-alignment
frames. It is reserved for international
use and should normally be kept at
one. If CRC processing is used, this
bit is ignored.
CRC-4 Modification. If one, activates
the CRC-4 remainder modification
function when the device is in trans-
parent mode. The received CRC-4
remainder is modified to reflect only
the changes in the transmit DL. If
zero, time slot zero data from DSTi
will not be modified in transparent
mode.
Reset. When this bit is changed from
low to high the MT9079 will reset to
its default mode. See the Reset
Operation section.
Automatic RAI Operation. If zero, the
Remote Alarm Indication bit will func-
tion automatically. That is, RAI = 0
when basic synchronization has been
acquired, and RAI = 1 when basic
synchronization
acquired. If one, the remote alarm
indication bit is controlled through the
TALM bit of the transmit non-frame
alignment control word.
Automatic Y-Bit Operation. If zero,
the Y-bit of the transmit multiframe
alignment signal will report the multi-
frame alignment status to the far end
i.e., zero - multiframe alignment
acquired, one - lost. If one, the Y-bit is
under the manual control of the trans-
mit
word.
Transmit Mode. If one, the MT9079 is
in transparent mode. If zero, it is in
termination mode.
CRC-4 Synchronization. If zero, basic
CRC-4 synchronization processing is
activated, and TIU0 bit and TIU1 bit
(frames 13 and 15) programming will
be overwritten. If one, CSYN is dis-
abled, the transmit CRC bits are pro-
grammed by TIU0 and the transmit E-
bits are programmed by either TxB0,
TxB1 or TIU1.
Automatic CRC-interworking. If zero,
automatic CRC-interworking is acti-
vated. If one, it is deactivated. See
Framing Algorithm section.
Functional Description
multiframe
alignment
has
Use
not
control
Zero.
been
* Not affected by the RST function - the state shown in ( ) can
be achieved by using the RESET function.
4 - 0
Bit
7
6
5
TNU4-8
(11111)
Name
TALM
TIU1
Table 27 - TNFA Control Word
(1)
(0)
---
(Page 1, Address 12H)
Transmit
When CRC-4 synchronization is dis-
abled, and TxB0 and TxB1 are not
connected to channel zero, this bit is
transmitted on the PCM 30 2048
kbit/sec. link in bit position one of
time slot zero of non-frame alignment
frames (international use bit). If
CRC-4 synchronization is enabled or
TxB0 or TxB1 are connected to time
slot zero, this bit is ignored.
Transmit Alarm. This bit is transmit-
ted on the PCM 30 2048 kbit/sec. link
in bit position three of time slot zero
of non-frame alignment frames. It is
used to signal an alarm to the remote
end of the PCM 30 link (one - alarm,
zero - normal). This control bit is
ignored when
address 11H).
Transmit National Use Four to Eight.
These bits are
PCM 30 2048 kbit/sec. link in bit posi-
tions four to eight of time slot zero of
non-frame alignment frame. See Sa4
- Sa8 control bits of the DL selection
word (page 1, address 10H).
Unused.
Functional Description
International
ARAI
transmitted on the
is zero (page 1,
Use
One.