XRT7250 datasheet(26/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

TxSer

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.

TxNib0

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.

TxNib1

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.

TxNib2

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.

TxNib3

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.

GND

****

Ground Pin

VDD

****

Power Supply pin

PIN DESCRIPTION

PIN #NAME

TYPE

DESCRIPTION

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