XRT75R03D_06 Datasheet, PDF (9/135 Pages) Exar Corporation – EXAR DATA SHEET FORMAT TEMPLATES

XRT75R03D
REV. 1.0.4
THREE CHANNEL E3/DS3/STS-1 LINE
SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS
PIN #
SIGNAL NAME
TYPE
DESCRIPTION
34 TPDATA_0/TxDATA_0
I
Transmit Positive Data Input - Channel 0:
3 TPDATA_1/TxDATA_1
25 TPDATA_2/TxDATA_2
Transmit Positive Data Input - Channel 1:
Transmit Positive Data Input - Channel 2:
Transmit Positive Data/Data Input - Channel n:
The function of these input pins depends upon whether the corresponding
channel has been configured to operate in the Single-Rail or Dual-Rail
Mode.
Single Rail Mode - Transmit Data Input - Channel n:
If the Channel has been configured to operate in the Single-Rail Mode,
then all transmit output data will be serially applied to this input pin. This
signal will latched into the Transmit Section circuitry upon either the rising
or falling edge of the TxCLK_n signal, depending upon user configuration.
In the Single-Rail Mode, the Transmit Section of the LIU IC will then encode
this data into either the B3ZS line code (for DS3 and STS-1 applications) or
the HDB3 line code (for E3 applications).
Dual Rail Mode - Transmit Positive Data Input - Channel n:
If the Channel has been configured to operate in the Dual-Rail Mode, then
the user should apply a pulse to this input pin, anytime the Transmit Sec-
tion of the LIU IC is suppose to generate and transmit a positive-polarity
pulse onto the line. This signal will be latched into the Transmit Section cir-
cuitry upon either the rising or falling edge of the TxCLK_n signal, depend-
ing upon user configuration.
In the Dual-Rail Mode, the Transmit Section of the LIU IC will NOT encode
this data into either the B3ZS or HDB3 line codes. If the user configures
the LIU IC to operate in the Dual-Rail Mode, then B3ZS/HDB3 encoding
must have already been done prior to providing the transmit output data to
this input pin.
33
TNData_0
2
TNData_1
24
TNData_2
I Transmit Negative Data Input - Channel 0:
Transmit Negative Data Input - Channel 1:
Transmit Negative Data Input - Channel 2:
If a Channel has been configured to operate in the Dual-Rail Mode, then
the user should apply a pulse to this input pin anytime the Transmit Section
of the LIU IC is suppose to generate and transmit a negative-polarity pulse
onto the line. This signal will be latched into the Transmit Section circuitry
upon either the rising or falling edge of the TxCLK_n signal, depending
upon user configuration.
NOTE: If the Channel has been configured operate in the Single-Rail Mode,
then this input pin has no function, and should be tied to GND.
5