MT9074AL Zarlink Semiconductor, Inc., MT9074AL Datasheet - Page 71

• Manufacturer Part Number: MT9074AL
• Description: T1/E1/J1 Single Chip Transceiver
• Manufacturer: Zarlink Semiconductor, Inc.

Data Sheet
Bit
7
6
3
Table 79 - Mode Selection Control Word (E1)
5
4
CRCM
Name
AUTC
AUTY
ASEL
ARAI
(Page 1, Address 10H)
AIS Select. This bit selects the
criteria on which the detection of a
valid Alarm Indication Signal (AIS)
is based. If zero, the criteria is less
than three zeros in a two frame
period (512 bits). If one, the criteria
is less than three zeros in each of
two
periods (512 bits per double
frame).
CRC-4
activates the CRC-4 remainder
modification function when the
device is in transparent mode. The
received
modified
changes in the transmit DL. If zero,
time slot zero data from DSTi will
not be modified in transparent
mode.
Automatic CRC-interworking. If
zero, automatic CRC-interworking
is activated. If one it is deactivated.
See Framing Algorithm for a
detailed description.
Automatic
Indication. if zero, the Remote
Alarm Indication bit (the A bit) will
function automatically. That is,
RAI=0 when basic synchronization
has been acquired. And, RAI=1
when basic synchronization has
not been 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 multiframe alignment
status to the far end i.e., zero -
multiframe
one - lost. If one, the Y-bit is under
the manual control of the Transmit
Multiframe
Word.
Functional Description
consecutive
Modification.
CRC-4
to
alignment
Alignment
Remote
reflect
remainder
double-frame
only
acquired,
If
Control
Alarm
one
the
is
Bit
Bit
Table 80 - Transmit Alarm Control Word (E1)
7
6
5
4
2
1
0
Table 79 - Mode Selection Control Word (E1)
TAIS16 Transmit AIS Time Slot 16. If one, an
Name
TxAO Transmit All Ones. When low, this
REFRM
- - -
Name
CSYN
MFRF
TE
Unused
Transmit E Bits. When zero and
CRC-4 synchronization is achieved,
the E-bits transmit the received CRC-
4 comparison results to the distant
end of the link, as per G.703. That is,
when
synchronization is lost, the transmit E-
bits will be zero. If one, and CRC-4
synchronization is lost the transmit E-
bits will be one.
all ones signal is transmitted in time
slot 16. If zero, time slot functions
normally.
control bit forces an unframed all ones
to be transmit at TTIP and TRING.
(Page 1, Address 10H)
(Page 1, Address 11H)
CRC-4 Synchronization. If zero,
basic
processing is activated, and the
TIU0
programming will be overwritten. If
one, CRC-4 synchronization is
disabled.
Address 10H, bit 5) is also one
then the first bits of channel 0 are
used as international use bits and
are programmed by the TIU0 and
TIU1.
Reframe. If one for at least one
frame, and then cleared, the
device will initiate a search for a
new
Reframing function is activated on
the one to zero transition of the
REFRM bit.
Multiframe Reframe. If one, for at
least one frame, and then cleared
the MT9074 will initiate a search
for a new signaling multiframe
position. Reframing function is
activated on the one to zero
transition of the MFRM bit.
Functional Description
Functional Description
Bit
basic
zero
CRC-4
If
and
AUTC
frame
and
synchronization
the
MT9074
(Page
TIU1
position.
CRC-4
bit
1,
71