MT9074AL Zarlink Semiconductor, Inc., MT9074AL Datasheet - Page 74

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

MT9074
74
Table 84 - Coding and Loopback Control Word
Table 85 - Non Frame Alignment Control Word
Bit
Bit
2
1
0
7
6
Name
RLBK
PLBK
SLBK
RxNFA
Name
- - -
(Page 1, Address 15H)
(Page 1, Address 16H)
Remote Loopback. If one, then all
bipolar data received on RRTIP/
RRING are directly routed to TTIP/
TRING on the PCM30 side of the
MT9074. If zero, then this feature is
disabled.
ST-BUS Loopback. If one, then all
time slots of DSTi are connected to
DSTo on the ST-BUS side of the
MT9074. If zero, then this feature is
disabled. See Loopbacks section.
Payload Loopback. If one, then all
time slots received on RTIP/RRING
are connected to TTIP/TRING on the
ST-BUS side of the MT9074 (this
excludes time slot zero). If zero, then
this feature is disabled. If receive
channel 16 data is to be included in
the looped data, then the control bit
TxCCS (Page 1, Address 14H, bit 5)
must be set high, otherwise transmit
signaling data, or HDLC1 data will be
placed into the outgoing channel 16
timeslot.
Unused.
Receive Non-frame Alignment
Byte.
contents of channel 0 of DSTo.
When RxNFA=1, channel 0 of
DSTo contains only data from the
received non frame alignment
signal (NFAS). When RxNFA = 0,
channel 0 of DSTo contains both
frame alignment and non frame
alignment bytes received with the
rest of the frame.
Functional Description
Functional Description
(E1)
(E1)
This
bit
decides
the
Table 85 - Non Frame Alignment Control Word
4-0
Bit
Bit
Table 86 - Multiframe and Data Link Selection
5
7
6
5
MFSEL
TNU4-8
Name
Name
TALM
- - - -
- - -
(Page 1, Address 16H)
(Page 1, Address 17H)
Unused
Multiframe
determines
multiframe
signaling) the RxMF (pin 42 in
PLCC, 23 in MQFP) signal is
aligned with. If zero, RxMF is
aligned with the receive signaling
multiframe. If one, RxMF is aligned
with
multiframe.
Unused
Transmit Remote Alarm. This bit
is transmitted on the PCM30 2048
kbit/sec. link in bit position three
(A bit) of time slot zero of NFAS
frames. It is used to signal an
alarm to the remote end of the
PCM30 link (one - alarm, zero -
normal). This control bit is ignored
when ARAI is zero (page 01H,
address 10H).
Transmit National Use Four to
Eight (Sa4 - Sa8). These bits are
transmitted on the PCM30 2048
kbit/sec. link in bit positions four to
eight of time slot zero of the NFA
frame, if selected by Sa4 - Sa8
control bits of the DL selection
word (page 01H, address 17H).
Functional Description
Functional Description
(E1)
(E1)
the
signal
Select.
receive
which
Data Sheet
(CRC-4
This
receive
CRC-4
bit
or