XRT72L13 Datasheet, PDF (211/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
If this bit-field is set to “0” then the “PRBS Checker/
Receiver” has not acquired “PRBS Lock” with the
payload portion of the “inbound” DS3 data stream.
Conversely, if this bit-field is set to “1”, then the
“PRBS Checker/Receiver” has acquired “PRBS Lock”
(or Pattern Sync) with the payload portion of the “in-
bound” DS3 data stream.
NOTE: The contents of this bit-field are valid only if the
“PRBS Checker/Receiver” is enabled.
Bit 3 - Rx PRBS Enable
This “Read/Write” bit-field permits the user to enable
the “PRBS Checker/Receiver” block within the
XRT72L13 M13 device.
Setting this bit-field to “0” disables the “PRBS Check-
er/Receiver” block.
Setting this bit-field to “1” enables the “PRBS Check-
er/Receiver” block.
Bit 2 - Tx PRBS Enable
This “Read/Write” bit-field permits the user to enable
or disable the “PRBS Generator/Transmitter” block
within the XRT72L13 M13 device.
Setting this bit-field to “0” disables the “PRBS Gener-
ator/Transmitter” block.
Setting this bit-field to “1” enables the “PRBS Genera-
tor/Transmitter” block.
Bit 1 - RxDS3 Bypass
To be defined in the next revision
Bit 0 - TxDS3 Bypass
To be defined in the next revision
3.3.2.14 Rx DS3 Configuration and Status Reg-
siter
RX DS3 CONFIGURATION AND STATUS REGISTER (ADDRESS = 0X10)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Rx AIS
Rx LOS
Rx Idle
Rx OOF
Reserved
Framing On
Parity
FSync
Algo
MSync
Algo
R/O
R/O
R/O
R/O
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Bit 7 - Rx AIS (Receive AIS Pattern) Indicator
This “Read-Only” bit-field indicates whether or not the
“Receive DS3 Framer” block (within the XRT72L13
M13 device) is currently receiving an AIS pattern or
not.
The XRT72L13 will set this bit-field to “0” if it is not
currently detecting an AIS pattern in the incoming da-
ta stream. Conversely, the XRT72L13 will set this bit-
field to “1” if it is currently receiving an AIS pattern in
the incoming data stream.
NOTE: For a detailed discussion on the AIS pattern please
see Section _.
Bit 6 - Rx LOS (Receive LOS Condition) Indicator
This “Read-Only” bit-field indicates whether or not the
“Receive DS3 Framer” block (within the XRT72L13
M13 device) is currently declaring an LOS (Loss of
Signal) condition of the incoming DS3 data stream.
If this bit-field is set to “0”, then the “Receive DS3
Framer” block (within the chip) is currently not declar-
ing an LOS condition.
If this bit-field is set to “1”, then the “Receive DS3
Framer” block (within the chip) is currently declaring
an LOS condition.
NOTE: For more information on the “LOS Declaration” crite-
ria, please see Section _.
Bit 5 - Rx Idle (Receive Idle Pattern) Indicator
This “Read-Only” bit-field indicates whether or not the
“Receive DS3 Framer” block (within the XRT72L13
M13 device) is currently detecting the “Idle Pattern” in
the “incoming” DS3 data stream.
If this bit-field is set to “0”, then the Receive DS3
Framer block (within the chip) is currently not detect-
ing the Idle pattern.
If this bit-field is set to “1”, then the Receive DS3
Framer block (within the chip) is currently detecting
the Idle pattern.
NOTE: For more information about the “Idle Pattern”,
please see Section _.
Bit 4 - Rx OOF (Receive Out-of-Frame) Indicator
This “Read-Only” bit-field indicates whether or not the
“Receive DS3 Framer” block (within the XRT72L13
199