xrt75r12 Exar Corporation, xrt75r12 Datasheet - Page 72

• Manufacturer Part Number: xrt75r12
• Description: Twelve Channel E3/ds3/sts-1 Line Interface Unit With Jitter
• Manufacturer: Exar Corporation

XRT75R12
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
B
Reserved
IT
B
N
IT
UMBER
7
6
7
T
Loss of PRBS
Loss of PRBS Pat-
ABLE
Pattern Sync
T
ABLE
B
R/O
Reserved
tern Lock
IT
33: XRT75R12 R
N
6
AME
34: A
LARM
Digital LOS
Declared
Defect
B
R/O
IT
S
T
R/O
5
YPE
TATUS
EGISTER
Loss of PRBS Pattern Lock Indicator:
This READ-ONLY bit-field indicates whether or not the PRBS Receiver
(within the Receive Section of Channel n) is declaring PRBS Lock within the
incoming PRBS pattern.
If the PRBS Receiver detects a very large number of bit-errors within its
incoming data-stream, then it will declare the Loss of PRBS Lock Condition.
Conversely, if the PRBS Receiver were to detect its pre-determined PRBS
pattern with the incoming DS3, E3 or STS-1 data-stream, (with little or no bit
errors) then the PRBS Receiver will clear the Loss of PRBS Lock condition.
0 - Indicates that the PRBS Receiver is currently declaring the PRBS Lock
condition within the incoming DS3, E3 or STS-1 data-stream.
1 - Indicates that the PRBS Receiver is currently declaring the Loss of
PRBS Lock condition within the incoming DS3, E3 or STs-1 data-stream.
N
Analog LOS
(n = [0:11] &
R
OTE
Declared
b. The PRBS Receiver is enabled.
EGISTER
a. The PRBS Generator block (within the Transmit Section of the Chip is
c. The PRBS Pattern (that is generated by the PRBS Generator) is
Defect
B
R/O
: This register bit is only valid if all of the following are true.
MAP
enabled).
somehow looped back into the Receive Path (via the Line-Side) and
in-turn routed to the receive input of the PRBS Receiver.
IT
4
SHOWING
- C
69
M
HANNEL
= 0-5 & 8-D)
(FIFO Limit)
Declared
Alarm
B
R/O
FL
IT
A
3
LARM
n A
DDRESS
S
Receive LOL
D
TATUS
ESCRIPTION
Declared
Defect
B
R/O
IT
L
2
OCATION
R
EGISTERS
Receive LOS
Declared
= 0
Defect
B
R/O
IT
(AS_n)
XM
1
3
Condition
Transmit
REV. 1.0.4
B
DMO
R/O
IT
0