![](http://datasheet.mmic.net.cn/Exar-Corporation/XRT94L43IB-F_datasheet_100164/XRT94L43IB-F_21.png)
XRT94L43
15
SONET/SDH OC-12 TO 12XDS3/E3 MAPPER
REV. 1.0.2
T4
TXL_CLKI_N
I
LVPECL
Transmit Reference Clock - Negative Polarity PECL Input:
This input pin, along with TxL_CLKI_P can be configured to func-
tion as the timing source for the STS-12/STM-4 Transmit Interface
Block.
If these two input pins are configured to function as the timing
source, then a 622.08MHz clock signal must be applied to these
input pins in the form of a PECL signal. These two inputs can be
configured to function as the timing source by writing the appropri-
ate data into the Interface Control Register - Byte 2 (Indirect
Address = 0x00, 0x31), (Direct Address = 0x0131).
N1
TXL_DATA_P
O
LVPECL
Transmit STS-12/STM-4 Data - Positive Polarity PECL Output:
This output pin, along with TXL_DATA_N functions as the Transmit
Data Output, to the System back-plane (for transmission to some
other System Board) or an Optical Transceiver (for transmission to
remote terminal equipment).
For High-Speed Back-Plane Applications, it should noted that data
is output from these output pins upon the rising/falling edge of
TXL_CLKO_P/TXL_CLKO_N).
NOTE: For APS (Automatic Protection Switching) purposes, this
output pin, along with TXL_DATA_N functions as the
Primary Transmit Data Output Port.
N2
TXL_DATA_N
O
LVPECL
Transmit STS-12/STM-4 Data - Negative Polarity PECL Output:
This output pin, along with TXL_DATA_P functions as the Transmit
Data Output, to the System back-plane (for transmission to some
other System Board) or an Optical Transceiver (for transmission to
remote terminal equipment).
For High-Speed Back-Plane Applications, it should noted that data
is output from these output pins upon the rising/falling edge of
TXL_CLKO_P/TXL_CLKO_N).
NOTE: For APS (Automatic Protection Switching) purposes, this
output pin, along with TXL_DATA_P functions as the
Primary Transmit Data Output Port.
P1
TXL_DATA_R_P
O
LVPECL
Transmit STS-12/STM-4 Data - Positive Polarity PECL Output -
Redundant Port:
This output pin, along with TXL_DATA_R_N functions as the
Transmit Data Output, to the System back-plane (for transmission
to some other System Board) or an Optical Transceiver (for trans-
mission to remote terminal equipment).
For High-Speed Back-Plane Applications, it should noted that data
is output from these output pins upon the rising/falling edge of
TXL_CLKO_R_P/TXL_CLKO_R_N).
NOTE: For APS (Automatic Protection Switching) purposes, this
output pin, along with TXL_DATA_N functions as the
Redundant Transmit Data Output Port.
SONET/SDH SERIAL LINE INTERFACE PINS
PIN #SIGNAL NAME
I/O
SIGNAL
TYPE
DESCRIPTION