XRT72L13 datasheet(39/370 Pages) EXAR

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

PRELIMINARY

REV. P1.0.6

162

TxNib_0/

TxSer

Transmit Nibble-Parallel Payload Data Input -0/Transmit Serial

Payload Data Input pin:

The exact function of this pin depends upon whether the XRT72L13 is

operating in the "Serial" or "Nibble-Parallel" interface Mode.

TxNib_0 - (Nibble Parallel Interface Mode):

The Terminal Equipment is expected to input data, that is intended to

be transmitted to the remote terminal, over a 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 "DS3" frame. The

XRT72L13 will sample the data that is at these input pins, upon the

rising edge of the "TxNibClk" signal.

Transmit Serial Payload Data Input Pin - (Serial Interface Mode):

The Terminal Equipment is expected to input data, that is intended to

be transmitted to the remote terminal, over a DS3 transport medium.

The Framer IC will take data, applied to this pin, and insert it into an

outbound "DS3" frame.

If the XRT72L13 M13 Multiplexer/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 "TxInClk". If the XRT72L13 M13 Multi-

plexer/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.

163

TxNib_1

Transmit Nibble-Paralle Payload Data Input -1:

The Terminal Equipment is expected to input data, that is intended to

be transmitted to the remote terminal, over a DS3 transport medium.

The Framer IC will take data, applied to this pin, and insert it into an

outbound "DS3" frame. The XRT72L13 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.

164

VDD

****

Power Supply Pin

165

TxNib_2

Transmit Nibble-Parallel Payload Data Input -2:

The Terminal Equipment is expected to input data, that is intended to

be transmitted to the remote terminal, over a DS3 transport medium.

The Framer IC will take data, applied to this pin, and insert it into an

outbound " DS3" frame. The XRT72L13 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.

166

TxNib_3

Transmit Nibble-Parallel Payload Data Input -3:

The Terminal Equipment is expected to input data, that is intended to

be transmitted to the remote terminal, over an 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 DS3"

frame. The XRT72L13 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.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

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