XR72L52 Datasheet, PDF(19/480 Page) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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XR72L52 Datasheet, PDF (19/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

PIN DESCRIPTIONS

XRT72L52

REV. 1.0.1

PIN DESCRIPTION

PIN #

1

2

PIN NAME

VDD

RxOOF[0]

3

RxLOS[0]

4

EncoDis[0]

TYPE

DESCRIPTION

**** Power Supply 3.3V + 5%

O Receiver Out of Frame Indicator:

The Receive Section of the XRT72L52 Framer asserts this output signal when-

ever it has declared an Out of Frame (OOF) condition with the incoming DS3 or

E3 frames. This signal is negated when the framer locates the framing align-

ment bits or bytes and correctly aligns itself with the incoming DS3 or E3 frames.

O Receive Section - Loss of Signal Output Indicator:

This pin is asserted when the Receive Section encounters a string of 180 con-

secutive â0âsâ for DS3 operation or 32 consecutive â0'sâ for E3 operation via the

RxPOS and RxNEG pins.

This pin is negated once the Receive Section has detected at least 60 pulses

within 180 bit-periods for DS3 operation or the Receive Section has detected a

string of 32 consecutive bits that does not contain a string of 4 consecutive 0âs,

for E3 operation.

O Encoder (HDB3) Disable Output pin (intended to be connected to the

XRT73L0x DS3/E3 Line Interface Unit IC):

This output pin is intended to be connected to the ENDECDIS input pin of the

XRT73L0x DS3/E3 Line Interface Unit IC when the device is being used in Hard-

ware mode. The user can control the state of this output pin by writing a "0" or

"1" to Bit 3 (Encodis) within the Line Interface Driver Register (Address = 0x80).

If this signal is toggled "High" then it disables the B3ZS/HDB3 encoder circuitry

within the XRT73L0x IC. If this output signal is toggled "Low", then the B3ZS/

HDB3 Encoder circuitry within the XRT73L0x IC is enabled.

If the XRT72L52 Framer has been configured to operate in the B3ZS/HDB3 line

code, disable the B3ZS/HDB3 encoder within the XRT73L0x IC.

NOTE: If the XRT73L0x DS3/E3 Line Interface Unit IC is not used, this output

pin may be used for other purposes.

3

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