XRT5997 Datasheet, PDF (14/37 Pages) Exar Corporation – Seven-Channel E1 Line Interface Unit

XRT5997
PIN DESCRIPTION (CONT'D)
Pin#
Symbol
Type
85
TxPOS7
I
86
TxNEG7
I
87
TxClk7
I
88
DGND
89
TTIP7
O
90
TVDD7
91
TRing7
O
92
TGND7
93
TRing1
O
94
TVDD1
Description
Transmitter - Positive Data Input – Channel 7:
The exact signal that should be applied to this input pin depends upon
whether the user intends to operate the “Transmit Section” (of Channel 7) in
the “Clocked” or “Clockless” Mode.
Clocked Mode:
The Terminal Equipment should apply bit-wide NRZ pulses on this input pin,
whenever the Terminal Equipment needs to transmit a “positive-polarity”
pulse onto the line via TTIP7 and TRing7 output pins. The XRT5997
device will sample this input pin upon the falling edge of the TClk7 signal.
Clockless Mode:
The Terminal Equipment should apply RZ pulses to this input pin, anytime the
Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line
via TTIP7 and TRing7 output pins.
Transmitter - Negative Data Input – Channel 7:
Transmitter Clock Input – Channel 7:
If the user operates Channel 7 (within the XRT5997 device) in the “clocked”
mode, then the “Transmit Section” of the Channel 7 will use the falling edge of
this signal to sample the data at the TxPOS7 and TxNEG7 input pins.
Note: If the user operates the Channel 7 in the “clockless” mode, then the
Terminal Equipment should not apply a clock signal to this input pin.
Digital Ground: Digital Circuitry.
Transmitter 7 Positive Bipolar Output:
Channel 7 within the XRT5997 device will use this pin, along with TRing7, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Positive Supply: (+3.3V ± 5%), Transmitters 7.
Transmitter 7 Negative Bipolar Output:
Channel 7 within the XRT5997 device will use this pin, along with TTIP7, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Digital Ground: Transmitters 7.
Transmitter 1 Negative Bipolar Output:
Channel 1 within the XRT5997 device will use this pin, along with TTIP1, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Positive Supply (+3.3V ± 5%), Transmitters 1.
Rev. 1.0.0
14