XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 91

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 1.0.1
Alarm Generation Register (AGR) - T1 Mode (Indirect Address = 0xn0H, 0x08H)
B
B
Reserved
IT
IT
B
N
R/W
N
IT
UMBER
0
0
UMBER
7
6
7
FAS Selection bit
Frame Dec-
Reserved
Loss of Frame
Declaration Enable
Loss of
laration
Enable
B
R/W
IT
0
6
B
B
IT
IT
N
N
AME
AME
Yellow Alarm
Select Bit 1
Generation
B
R/W
IT
0
5
B
B
Yellow Alarm
IT
IT
R/W
R/W
Select Bit 0
Generation
X
T
T
YPE
YPE
B
R/W
IT
0
4
FAS Selection:
This Read/Write bit field allows the user to determine which algo-
rithm is used for searching FAS frame alignment pattern. When
an FAS alignment pattern is found and locked, the XRT84L38
will generate Receive Synchronization (RxSync_n) pulse.
When this bit is set to 0:
Algorithm 1 is selected for searching FAS frame alignment pat-
tern.
When this bit is set to 1:
Algorithm 2 is selected for searching FAS frame alignment pat-
tern.
Loss of Frame Declaration Enable:
This READ/WRITE bit-field permits the framer to declare Red
Alarm in case of Loss of Frame Alignment (LOF).
When receiver module of the framer detects Loss of Frame
Alignment in the incoming data stream, it will generate a Red
Alarm. The framer will also generate an RxLOFs interrupt to
notify the microprocessor that an LOF condition is occurred. A
Yellow Alarm is then returned to the remote transmitter to report
that the local receiver detects LOF.
When this bit is set to zero:
Red Alarm declaration is disabled.
When this bit is set to one:
Red Alarm declaration is enabled.
71
Select Bit 1
Generation
Indication
Signal
Alarm
B
R/W
IT
0
3
Select Bit 0
Generation
Indication
B
B
Signal
Alarm
B
R/W
IT
IT
IT
0
D
D
2
ESCRIPTION
ESCRIPTION
OCTAL T1/E1/J1 FRAMER
Select Bit 1
Indication
Detection
Signal
Alarm
B
R/W
IT
0
1
XRT84L38
Select Bit 0
Indication
Detection
Signal
Alarm
B
R/W
IT
0
0