XRT83L314 View Datasheet(PDF) - Exar Corporation
Part Name
Description
Manufacturer
XRT83L314 Datasheet PDF : 84 Pages
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XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
TRANSMITTER SECTION
NAME
PIN
TxON
AC20
TYPE
I
DMO
Y4
O
TCLK13
Y16
I
TCLK12
Y17
TCLK11
AC18
TCLK10
D16
TCLK9
C17
TCLK8
A19
TCLK7
B16
TCLK6
D7
TCLK5
A3
TCLK4
B5
TCLK3
B6
TCLK2
AC6
TCLK1
AC5
TCLK0
AC7
TPOS13
AB17
I
TPOS12
AA18
TPOS11
AB18
TPOS10
A18
TPOS9
D17
TPOS8
B19
TPOS7
A17
TPOS6
B7
TPOS5
C4
TPOS4
B4
TPOS3
D6
TPOS2
AB6
TPOS1
AA6
TPOS0
Y8
DESCRIPTION
Transmit On/Off Input
Upon power up, the transmitters are powered off. Turning the transmitters On
or Off is selected through the microprocessor interface by programming the
appropriate channel register if this pin is pulled "High". If the TxON pin is
pulled "Low", all 14 transmitters are powered off.
NOTE: TxON is ideal for redundancy applications. See the Redundancy
Applications Section of this datasheet for more details. Internally
pulled "Low" with a 50KΩ resistor.
Digital Monitor Output (Global Pin for All 14-Channels)
When no transmit output pulse is detected for more than 128 TCLK cycles on
one of the 14-channels, the DMO pin will go "High" for a minimum of one TCLK
cycle. DMO will remain "High" until the transmitter sends a valid pulse.
NOTE: This pin is for redundancy applications to initiate an automatic switch to
the backup card. For individual channel DMO, see the register map.
Transmit Clock Input
TCLK is the input facility clock used to sample the incoming TPOS/TNEG data.
If TCLK is absent, pulled "Low", or pulled "High", the transmitter outputs at
TTIP/TRING can be selected to send an all ones or an all zero signal by pro-
gramming TCLKCNL in the appropriate global register. TPOS/TNEG data can
be sampled on either edge of TCLK selected by TCLKE in the appropriate glo-
bal register.
NOTE: TCLKE is a global setting that applies to all 14 channels.
TPOS/TDATA Input
Transmit digital input pin. In dual rail mode, this pin is the transmit positive
data input. In single rail mode, this pin is the transmit non-return to zero (NRZ)
data input.
NOTE: Internally pulled "Low" with a 50KΩ resistor.
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