XRT72L13 datasheet(40/370 Pages) EXAR

40 / 370 page

XRT72L13

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

REV. P1.0.6

PRELIMINARY

167

TxOHIns

Transmit Overhead Data Insert Input.

Asserting this input signal (e.g., setting it "high") enables the Transmit

Overhead Data Input Interface to accept "overhead" data from the

Terminal Equipment. In other words, while this input pin is "high", the

Transmit Overhead Data Input Interface will sample the data at the

"TxOH" input pin, on the falling edge of the "TxOHClk" output signal.

Conversely, setting this pin "low" configures the "Transmit Overhead

Data Input Interface" to NOT sample (e.g., ignore) the data at the

"TxOH" input pin, on the falling edge of the "TxOHClk" output signal.

NOTES:

1. If the Terminal Equipment attempts to insert an overhead bit

that cannot be accepted by the "Transmit Overhead Data

Input Interface" (e.g., if the Terminal Equipment asserts the

"TxOHIns" signal, at a time when one of these "non-insert-

able" overhead bits are being processed); that particular

insertion effort will be ignored.

2. This pin is only used in “Clear-Channel Framer” applications.

168

TxAISEn

Transmit AIS Command Input:

Setting this input pin "high" configures the XRT72L13 to transmit an

AIS (Alarm Indication Signal) pattern to the remote terminal.

Setting this input pin “low” configures the Transmit Section to generate

DS3 traffic in a normal manner.

169

TxOHFrame

Transmit Overhead Frame:

This output pin pulses "high" when the Transmit Overhead Data Input

Interface block is expecting the first Overhead bit, within a DS3 frame

to be applied to the TxOH input pin.

This pin is "high" for one clock period of TxOHClk.

170

TxOHEnable

Transmit Overhead Frame Enable:

The XRT72L13 will assert this signal, for one “TxInClk” period, just

prior to the instant that the “Transmit Overhead Data Input Interface”

will be sampling and processing an overhead bit.

If the Terminal Equipment intends to insert its own value for an over-

head bit, into the outbound DS3 frame, it is expected to sample the

state of this signal, upon the falling edge of “TxInClk”. Upon sampling

the “TxOHEnable” high, the Terminal Equipment should (1) place the

desired value of the overhead bit, onto the “TxOH” input pin and (2)

assert the “TxOHIns” input pin. The Transmit Overhead Data Input

Interface” block will sample and latch the data on the “TxOH” signal,

upon the rising edge of the very next “TxInClk” input signal.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 40 Page - Exar Corporation

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