82V2042EPF8 IDT, Integrated Device Technology Inc, 82V2042EPF8 Datasheet - Page 34

• Manufacturer Part Number: 82V2042EPF8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2042EPF8

• Screening Level: Industrial
• Mounting: Surface Mount
• Package Type: TQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

3.8.4
ing channel is configured in Inband Loopback mode. In this mode, an
unframed activate/Deactivate Loopback Code is generated repeatedly in
transmit direction per ANSI T1. 403 which overwrite the transmit signals.
In receive direction, the framed or unframed code is detected per ANSI T1.
403, even in the presence of 10
(MAINT1, 0DH...) to ‘1’, the chip will establish/demolish the Remote Loop-
back based on the reception of the Activate Loopback Code/ Deactivate
Loopback Code for 5.1 s. If the ARLP bit (MAINT1, 0DH...) is set to ‘0’, the
Remote Loopback can also be demolished forcedly.
3.8.4.1 Transmit Activate/Deactivate Loopback Code
defined by the TIBLB[7:0] bits (MAINT3, 0FH...). Whether the code repre-
sents an Activate Loopback Code or a Deactivate Loopback Code is judged
by the far end receiver. The length of the pattern ranges from 5 bits to 8 bits,
as selected by the TIBLB_L[1:0] bits (MAINT2, 0EH...). The pattern can be
programmed to 6-bit-long or 8-bit-long respectively by repeating itself if it
is 3-bit-long or 4-bit-long. When the PATT[1:0] bits (MAINT0, 0CH...) are
set to ‘11’, the transmission of the Activate/Deactivate Loopback Code is
initiated. If the PATT_CLK bit (MAINT0, 0CH...) is set to ‘0’ and the
PATT[1:0] bits (MAINT0, 0CH...) are set to ‘00’, the transmission of the Acti-
vate/Deactivate Loopback Code will stop.
as the receive code setting in the remote end. It is the same thing for the
other way round.
FUNCTIONAL DESCRIPTION
IDT82V2042E
When PATT[1:0] bits (MAINT0, 0CH...) are set to ‘11’, the correspond-
If the Automatic Remote Loopback is enabled by setting ARLP bit
The pattern of the transmit Activate/Deactivate Loopback Code is
The local transmit activate/deactivate code setting should be the same
CVn/RDNn
RDn/RDPn
TDn/TDPn
RCLKn
INBAND LOOPBACK
TCLKn
LOSn
TDNn
Detection
LOS/AIS
HDB3/AMI
HDB3/AMI
Decoder
Encoder
B8ZS/
B8ZS/
-2
bit error rate.
Loopback
Remote
Attenuator
Attenuator
Jitter
Jitter
Figure-16 Remote Loopback
Clock and
Recovery
Waveform
Data
Shaper
DUAL CHANNEL T1/E1/J1 SHORT HAUL LINE INTERFACE UNIT
34
3.8.4.2 Receive Activate/Deactivate Loopback Code
RIBLBA[7:0] bits (MAINT4, 10H...). The length of this pattern ranges from
5 bits to 8 bits, as selected by the RIBLBA_L [1:0] bits (MAINT2, 0EH...).
The pattern can be programmed to 6-bit-long or 8-bit-long respectively by
repeating itself if it is 3-bit-long or 4-bit-long.
RIBLBD[7:0] bits (MAINT5, 11H...). The length of the receive Deactivate
Loopback Code ranges from 5 bits to 8 bits, as selected by the
RIBLBD_L[1:0] bits (MAINT2, 0EH...). The pattern can be programmed to
6-bit-long or 8-bit-long respectively by repeating itself if it is 3-bit-long or 4-
bit-long.
for more than 30 ms (in E1 mode) / 40 ms (in T1/J1 mode), the IBLBA_S
bit (STAT0, 16H...) will be set to ‘1’ to declare the reception of the Activate
Loopback Code.
data for more than 30 ms (In E1 mode) / 40 ms (In T1/J1 mode), the IBLBD_S
bit (STAT0, 16H...) will be set to ‘1’ to declare the reception of the Deactivate
Loopback Code.
transition of the IBLBA_S bit will generate an interrupt and set the IBLBA_IS
bit (INTS0, 18H...) to ‘1’. When the IBLBA_IES bit is set to ‘1’, any changes
of the IBLBA_S bit will generate an interrupt and set the IBLBA_IS bit
(INTS0, 18H...) to ‘1’. The IBLBA_IS bit will be reset to ‘0’ after being read.
transition of the IBLBD_S bit will generate an interrupt and set the IBLBD_IS
bit (INTS0, 18H...) to ‘1’. When the IBLBD_IES bit is set to ‘1’, any changes
of the IBLBD_S bit will generate an interrupt and set the IBLBD_IS bit
(INTS0, 18H...) to ‘1’. The IBLBD_IS bit will be reset to ‘0’ after being read.
The pattern of the receive Activate Loopback Code is defined by the
The pattern of the receive Deactivate Loopback Code is defined by the
After the Activate Loopback Code has been detected in the receive data
After the Deactivate Loopback Code has been detected in the receive
When the IBLBA_IES bit (INTES, 15H...) is set to ‘0’, only the ‘0’ to ‘1’
When the IBLBD_IES bit (INTES, 15H...) is set to ‘0’, only the ‘0’ to ‘1’
Slicer
Data
Driver
Line
Equalizer
Adaptive
One of the Two Identical Channels
Termination
Transmitter
Termination
Internal
Receiver
Internal
December 12, 2005
RTIPn
RRINGn
TTIPn
TRINGn