XRT73L03 Datasheet, PDF (55/62 Pages) Exar Corporation – 3 CHANNEL E3/DS3/STS-1 LINE INTERFCE UNIT

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PRELIMINARY
3 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT XRT73L03
REV. P1.0.13
Address
The register addresses are presented in the Hexa-
decimal format.
Type:
The Command Registers are either Read-Only (RO)
or Read/Write (R/W) registers. Each channel of the
XRT73L03 has eight command registers, CR0-(n)
through CR7-(n) where (n) = 1, 2 or 3. The associat-
ed addresses for each channel is presented in
Table 2.
NOTE: The default value for each of the bit-fields in these
registers is "0".
5.2 DESCRIPTION OF BIT-FIELDS FOR EACH COM-
MAND REGISTER
5.2.1 Command Register - CR0-(n)
The bit-format and default values for Command Reg-
ister CR0-(n) are listed below followed by the function
of these bit-fields.
COMMAND REGISTER CR0-(N)
D4
RLOL
1
D3
RLOS
1
D2
ALOS
1
D1
DLOS
1
D0
DMO
1
Bit D4 - RLOL1 (Receive Loss of Lock Status -
Channel(n))
This Read-Only bit-field reflects the lock status of the
Channel(n) Clock Recovery Phase-Locked-Loop in
the XRT73L03.
This bit-field is set to “0" if the Clock Recovery PLL is
in lock with the incoming line signal. This bit-field is
set to "1" if the Clock Recovery PLL is out of lock with
the incoming line signal.
Bit D3 - RLOS1 (Receive Loss of Signal Status -
Channel(n))
This Read-Only bit-field indicates whether or not
Channel(n) of the Receiver is currently declaring an
LOS (Loss of Signal) Condition.
This bit-field is set to "0" if Channel(n) is NOT current-
ly declaring the LOS Condition or, this bit-field is set
to "1" if Channel(n) is declaring an LOS Condition.
Bit D2 - ALOS1 (Analog Loss of Signal Status -
Channel(n))
This Read-Only bit-field indicates whether or not the
Channel(n) Analog LOS Detector is currently declar-
ing an LOS condition.
This bit-field is set to "0" if the Analog LOS Detector is
NOT currently declaring a LOS condition. This bit-
field is set to "1" if the Analog LOS Detector is cur-
rently declaring a LOS condition.
NOTE: The purpose is to isolate the Detector (e.g., either
the Analog LOS or the Digital LOS detector) that is declar-
ing the LOS condition. This feature may be useful for trou-
bleshooting/debugging purposes.
Bit D1 - DLOS1 (Digital Loss of Signal Status -
Channel(n))
This Read-Only bit-field indicates whether or not the
Channel(n) Digital LOS Detector is currently declar-
ing an LOS condition.
This bit-field is set to "0" if the Digital LOS Detector is
NOT currently declaring an LOS condition. This bit-
field is set to "1" if the Digital LOS Detector is current-
ly declaring an LOS condition.
NOTE: The purpose is to isolate the Detector (e.g., either
the Analog LOS or the Digital LOS detector) that is declar-
ing the LOS condition. This feature may be useful for trou-
bleshooting/debugging purposes.
Bit D0 - DMO (Drive Monitor Output Status - Chan-
nel(n))
This Read-Only bit-field reflects the status of the
DMO output pin.
5.2.2 Command Register CR1
The bit-format and default values for Command Reg-
ister CR1-(n) are listed below followed by the function
of these bit-fields.
COMMAND REGISTER CR1-(N)
D4
D3
D2
D1
D0
TxOFF(n) TAOS(n) TxClkINV(n) TxLEV(n) TxBIN(n)
0
0
0
0
0
Bit D4 - TxOFF(n) (Transmitter OFF - Channel(n))
This Read/Write bit-field is used to turn off the Chan-
nel(n) Transmitter.
Writing a "1" to this bit field turns off the Transmitter
and tri-state the Transmit Output. Writing a "0" to this
bit-field turns on the Transmitter.
Bit D3 - TAOS(n) (Transmit All OneS - Channel(n))
This Read/Write bit-field is used to command the
Channel(n) Transmitter to generate and transmit an
all “1’s” pattern onto the line.
Writing a "1" to this bit-field commands the Transmit-
ter to transmit an all “1’s” pattern onto the line. Writ-
ing a "0" to this bit-field commands normal operation.
Bit D2 - TxClkINV(n) (Transmit Clock Invert -
Channel(n))
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