XRT73LC04A_08 Datasheet, PDF (59/64 Pages) Exar Corporation – 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

XRT73LC04A
REV. 1.0.2
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
Bit D4 - Reserved
Bit D3 - Reserved
Bit D2 - ALOSDIS_(n) (Analog LOS Disable -
Channel(n))
This Read/Write bit-field is used to enable or disable
the Channel(n) Analog LOS Detector.
Writing a "0" to this bit-field enables the Analog LOS
Detector. Writing a "1" to this bit-field disables the
Analog LOS Detector.
NOTE: If the Analog LOS Detector is disabled, then the
RLOS input pin is only asserted by the DLOS (Digital LOS
Detector).
Bit D1 - DLOSDIS_(n) (Digital LOS Disable - Chan-
nel(n))
This Read/Write bit-field to used to enable or disable
the Channel(n) Digital LOS Detector .
Writing a "0" to this bit-field enables the Digital LOS
Detector. Writing a "1" to this bit-field disables the
Digital LOS Detector.
NOTE: If the Digital LOS Detector is disabled, then the
RLOS input pin is only asserted by the ALOS (Analog LOS
Detector).
Bit D0 - REQEN_(n) (Receive Equalization Enable
- Channel(n))
This Read/Write bit-field is used to enable or disable
the internal Channel(n) Receive Equalizer.
Writing a "1" to this bit-field enables the Internal
Equalizer. Writing a "0" to this bit-field disables the
Internal Equalizer.
5.2.4 Command Register CR3-(n)
The bit-format and default values for Command Reg-
ister CR3-(n) are listed below followed by the function
of each of these bit fields.
COMMAND REGISTER CR3-(n)
D4
D3
D2
D1
D0
SR/DR_(n)
LOSMUT_(n)
RxOFF
RxClk_(n)INV
Reserved
0
0
0
0
0
Bit D4 - SR/DR (Single-Rail/Dual-Rail Data Output
- Channel(n))/(B3ZS/HDB3 Encoder/Decoder-Dis-
able - Channel(n))
This Read/Write bit-field is used to configure Chan-
nel(n) to output the received data from the Remote
Terminal in a binary or Dual-Rail format and Enable
or Disable the B3ZS/HDB3 Encoder and Decoder
blocks.
Writing a "1" to this bit-field enables the B3ZS/HDB3
Encoder and Decoder blocks. Writing a "0" to this bit-
field disables the B3ZS/HDB3 Encoder and Decoder
blocks.
NOTE: This Encoder/Decoder performs HDB3 Encoding/
Decoding if the XRT73LC04A is operating in the E3 Mode.
Otherwise, it performs B3ZS Encoding/Decoding.
.Writing a "1" to this bit-field also configures Chan-
nel(n) to output data to the Terminal Equipment in a
binary (Single-Rail) format via the RPOS_(n) output
pin, RNEG_(n) is grounded. Writing a "0" to this bit-
field configures Channel(n) to output data to the Ter-
minal Equipment in a Dual-Rail format via both the
RPOS_(n) and RNEG_(n) output pins.
Bit D3 - LOSMUT_(n) (Recovered Data Muting,
during LOS Condition - Channel(n))
This Read/Write bit-field is used to configure Chan-
nel(n) to not output any recovered data from the line
while it is declaring an LOS condition.
Writing a "0" to this bit-field configures the chip to out-
put recovered data even while the XRT73LC04A is
declaring an LOS condition. Writing a "1" to this bit-
field configures the chip to NOT output the recovered
data while an LOS condition is being declared.
NOTE: In this mode, RPOS_(n) and RNEG_(n) is set to "0",
asynchronously.
Bit D2 - RxOFF (Receive Section - Shut OFF Se-
lect)
This Read/Write bit-field is used to shut-off the Re-
ceive Sections. The purpose is to conserve power
consumption when this device is the back-up device
in a Redundancy System.
Writing a "1" into this bit-field shuts off the Receive
Sections. Writing a "0" into this bit-field turns on the
Receive Sections.
Bit D1 - RxClk_(n)INV (Invert RxClk_(n))
This Read/Write bit-field is used to configure the
Channel(n) Receiver to output the recovered data on
either the rising edge or the falling edge of the
RxClk_(n) clock signal.
Writing a "0" to this bit-field configures the Receiver to
output the recovered data on the rising edge of the
RxClk_(n) output signal. Writing a "1" to this bit-field
configures the Receiver to output the recovered data
on the falling edge of the RxClk_(n) output signal.
Bit D0 - Reserved
55