XRT7250 Datasheet, PDF (26/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

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PIN DESCRIPTION
PIN #
45
NAME
TxSer
46
TxNib0
47
TxNib1
48
TxNib2
49
TxNib3
50
GND
51
VDD
DS3/E3 FRAMER IC
XRT7250
REV. 1.1.1
TYPE
DESCRIPTION
I Transmit Serial Payload Data Input Pin:
The Terminal Equipment is expected to input data, that is intended to be trans-
mitted to the remote terminal, over an E3 or DS3 transport medium. The
Framer IC will take data, applied to this pin, and insert it into an outbound "E3
or DS3" frame.
If the XRT7250 Framer IC has been configured to operate in the "Local Time"
Mode, then it will sample the data (on this pin) upon the rising edge of "TxIn-
Clk". If the XRT7250 Framer IC has been configured to operate in the "Loop-
Time" Mode, then it will sample the data (on this pin) upon the rising edge of
"RxOutClk".
NOTE: This input pin is active only if the Serial Mode has been selected.
I Transmit Nibble-Parallel Payload Data Input -0:
The Terminal Equipment is expected to input data, that is intended to be trans-
mitted to the remote terminal, over an E3 or DS3 transport medium. The
Framer IC will take data, applied to this pin (along with TxNib1, TxNib2, and
TxNib3), and insert it into an outbound "E3 or DS3" frame. The XRT7250 will
sample the data that is at these input pins, upon the rising edge of the "TxNib-
Clk" signal.
NOTE: This input pin is active only if the Nibble-Parallel Mode has been
selected.
I Transmit Nibble-Parallel Payload Data Input -1:
The Terminal Equipment is expected to input data, that is intended to be trans-
mitted to the remote terminal, over an E3 or DS3 transport medium. The
Framer IC will take data, applied to this pin, and insert it into an outbound "E3
or DS3" frame. The XRT7250 will sample the data that is at these input pins,
upon the rising edge of the "TxNibClk" signal.
NOTE: This input pin is active only if the Nibble-Parallel Mode has been
selected.
I Transmit Nibble-Parallel Payload Data Input -2:
The Terminal Equipment is expected to input data, that is intended to be trans-
mitted to the remote terminal, over an E3 or DS3 transport medium. The
Framer IC will take data, applied to this pin, and insert it into an outbound "E3
or DS3" frame. The XRT7250 will sample the data that is at these input pins,
upon the rising edge of the "TxNibClk" signal.
NOTE: This input pin is active only if the Nibble-Parallel Mode has been
selected.
I Transmit Nibble-Parallel Payload Data Input -3:
The Terminal Equipment is expected to input data, that is intended to be trans-
mitted to the remote terminal, over an E3 or DS3 transport medium. The
Framer IC will take data, applied to this pin (along with TxNib1, TxNib2, and
TxNib3), and insert it into an outbound "E3 or DS3" frame. The XRT7250 will
sample the data that is at these input pins, upon the rising edge of the "TxNib-
Clk" signal.
NOTE: This input pin is active only if the Nibble-Parallel Mode has been
selected.
**** Ground Pin
**** Power Supply pin
7