XRT72L13 datasheet(37/370 Pages) EXAR

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

PRELIMINARY

REV. P1.0.6

155

DS2OutClk

Transmit DS2 Clock Output

156

TxFrameRef

Transmit Framer Reference Input:

This input pin functions as the "Transmit Frame Generation" reference

signal, if the XRT72L13 has been configured to operate in the "Local-

Time/Frame Slave" Mode. If the XRT72L13 has been configured to

operate in the "Local-Time/Frame-Slave" Mode, then the user's termi-

nal equipment is expected to apply a pulse (to this input pin) once

every 106.4 microseconds.

In the "Local-Time/Frame-Slave" Mode, the Transmit Section of the

XRT72L13 M13 Multiplexer/Framer IC will initiate its generation of a

new "outbound" DS3 frame, upon the rising edge of this signal.

NOTE: The user can configure the XRT72L13 M13 Multiplexer/Framer

IC to operate in the "Local Time/Frame Slave" Mode by writing "xxxx

xx01" into the "Operating Mode" Register (Address = 0x00).

157

TxFrame

Transmit End of DS3 Frame Indicator:

.The Transmit Section of the XRT72L13 will pulse this output pin

"high" (for one bit-period), when the Transmit Payload Data Input

Interface is processing the last bit of a given DS3 frame.

The purpose of this output pin is to alert the Terminal Equipment that

it needs to begin transmission of a new DS3 frame to the XRT72L13

(e.g., to permit the XRT72L13 to maintain Transmit DS3 framing align-

ment control over the Terminal Equipment).

158

TxInClk

Transmit Framer Reference Clock Input.

This input pin functions as the "Timing Reference" for the Transmit

Section of the "Clear Channel DS3 Framer" block within XRT72L13

M13 Multiplexer/Framer IC; if the device has been configured to oper-

ate in the "Local-Time" Mode. Further, if the XRT72L13 M13 Multi-

plexer/Framer IC has been configured to operate in the "Local-Time"

Mode, the "Transmit Payload Data Input Interface will sample the data

at the TxSer input pin, upon the rising edge of "TxInClk".

NOTES:

1. The user should apply a 44.736MHz clock signal to this input

pin.

2. The user can configure the XRT72L13 M13 Multiplexer/

Framer IC to operate in the "Local-Time" mode by writing

"xxxx xx01" or "xxxx xx1x" into the "Operating Mode" register

(Address = 0x00).

159

TxNibFrame

Transmit Frame Boundary Indicator - Nibble/Parallel Interface

This output pin pulses "high" when the last nibble of a given DS3

frame is expected at the TxNib[3:0] input pins.

The purpose of this output pin is to alert the Terminal Equipment that

it needs to begin transmission of a new DS3 frame to the XRT72L13.

NOTE: This pin is only used for “Clear-Channel Framer” applications.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

XRT72L13 Datasheet(PDF) 37 Page - Exar Corporation

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