XRT91L81IB View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT91L81IB' PDF : 40 Pages View PDF
XRT91L81
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
REV. P1.0.3
PRELIMINARY
TABLE 8: MICROPROCESSOR REGISTER BIT DESCRIPTION
CHANNEL 0 CONTROL REGISTER (0X01H)
BIT
NAME
FUNCTION
Register
Type
Default
Value
(HW reset)
D7
Reserved This Register Bit is Not Used
X
X
D6
Reserved This Register Bit is Not Used
X
X
D5
Reserved This Register Bit is Not Used
X
X
D4
VCXOIS Voltage Controlled External Oscillator Lock Interrupt Status
RUR
0
"0" = No Change
"1" = Change in Status Occured
D3
LOSIS Loss of Signal Interrupt Status
"0" = No Change
"1" = Change in Status Occured
RUR
0
D2
CDRIS Clock and Data Recovery Lock Interrupt Status
"0" = No Change
"1" = Change in Status Occured
RUR
0
D1
CMUIS Clock Multiplier Unit Lock Interrupt Status
"0" = No Change
"1" = Change in Status Occured
RUR
0
D0
FIFOIS FIFO Overflow Interrupt Status
"0" = No Change
"1" = Change in Status Occured
RUR
0
TABLE 9: MICROPROCESSOR REGISTER BIT DESCRIPTION
CHANNEL 0 CONTROL REGISTER (0X02H)
BIT
NAME
FUNCTION
Register
Type
Default
Value
(HW reset)
D7
Reserved This Register Bit is Not Used
X
X
D6
Reserved This Register Bit is Not Used
X
X
D5
Reserved This Register Bit is Not Used
X
X
D4
VCXOID Voltage Controlled External Oscillator Lock Detection
RO
0
The VCXOID is used to indicate whether the internal clock refer-
ence is locked to an external VCO. An interrupt will not occur
unless the VCXOIE is set to "1" in the channel register 0x00h.
"0" = No Alarm
"1" = No lock has occured for VCXO
30
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