XRT72L13 datasheet(155/370 Pages) EXAR

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

REV. 1.0.6

143

Writing a "1" into this bit-field commands the

XRT72L13 M13 device to toggle the "LLOOP" output

signal "high". Writing a "0" into this bit-field com-

mands the XRT72L13 M13 device to toggle this out-

put signal "low".

For a detailed description of the XRT7300 DS3/E3

LIU's operation, during each of these above-men-

tioned loop-back modes, please consult the

"XRT7300 DS3/E3/STS-1 LIU IC" Data Sheet.

NOTE: If the customer is not using the XRT7300 DS3/E3/

STS-1 LIU IC, then he/she can use this bit-field and the

"LLOOP" output pin for other purposes.

2.3.2.95 Line Interface Scan Register

Bit 2 - DMO - (Drive Monitor Output)

This "Read-Only" bit-field indicates the logic state of

the DMO input pin of the XRT72L13 M13 device.

This input pin is intended to be connected to the DMO

output pin of the XRT7300 DS3/E3 LIU IC. If this bit-

field contains a logic "1", then the DMO input pin is

"high". The XRT7300 DS3/E3 LIU IC will set this pin

"high" if the drive monitor circuitry (within the

XRT7300) has not detected any bipolar signals at the

MTIP and MRING inputs (of the XRT7300) within the

last 128 + 32 bit periods.

Conversely, if this bit-field contains a logic "0", then

the DMO input pin is "high". The XRT7300 DS3/E3

LIU IC will set this pin "low" if bipolar signals are be-

ing detected at the MTIP and MRING input pins.

NOTE: If this customer is not using the XRT7300 DS3/E3

LIU IC, then he/she can use this input pin for a variety of

other purposes.

Bit 1 - RLOL - (Receive Loss of Lock)

This "Read-Only" bit-field indicates the logic state of

the RLOL input pin of the XRT72L13 M13 device.

This input pin is intended to be connected to the

RLOL output pin of the XRT7300 DS3/E3 LIU IC. If

this bit-field contains a logic "1", then the RLOL input

pin is "high". The XRT7300 DS3/E3 LIU IC will set

this pin "high" if the clock recovery phase-locked-loop

circuitry (within the XRT7300) has lost "lock" with the

incoming DS3/E3 data-stream and is not properly re-

covering clock and data.

Conversely, if this bit-field contains a logic "0", then

the RLOL input pin is "low". The XRT7300 DS3/E3

LIU IC will hold this pin "low" as long as this "clock re-

covery phase-locked-loop" circuitry (within the

XRT7300) is properly "locked" onto the incoming DS3

data-stream, and is properly recovering clock and da-

ta from this data-stream.

For more information on the operation of the

XRT7300 DS3/E3/STS-1 LIU IC, please consult the

"XRT7300 DS3/E3/STS-1 LIU IC" data sheet.

NOTE: If the customer is not using the XRT7300 DS3/E3/

STS-1 IC, then he/she can use this bit-field, and the RLOL

input pin for other purposes.

Bit 0 - RLOS - (Receive Loss of Signal)

This "Read-Only" bit-field indicates the logic state of

the RLOS input pin of the XRT72L13 M13 device.

This input pin is intended to be connected to the

RLOS output pin of the XRT7300 DS3/E3 LIU IC. If

this bit-field contains a logic "1", then the RLOS input

pin is "high". The XRT7300 will toggle this signal

"high" if it (the XRT7300 LIU IC) is currently declaring

an LOS (Loss of Signal) condition.

Conversely, if this bit-field contains a logic "0", then

the RLOS input pin is "low". The XRT7300 will hold

this signal "low" if it is NOT currently declaring an

LOS (Loss of Signal) condition.

For more information on the LOS Declaration and

Clearance criteria of the XRT7300, please consult the

"XRT7300 DS3/E3/STS-1 LIU IC" data sheet.

NOTE: Asserting the RLOS input pin will cause the XRT

72L13 DS3 Framer IC to generate the "Change in LOS

Condition" interrupt and declare an "LOS" (Loss of Signal)

condition. Therefore, this input pin should not be used as a

general purpose input.

Digital Local Loop-back Mode

RLOOP

LLOOP

RESULTING LOOP-BACK MODE OF THE XRT7300

LINE INTERFACE SCAN REGISTER (ADDRESS = 0X81)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

DMO

RLOL

RLOS

0000

000

XRT72L13 Datasheet(PDF) 155 Page - Exar Corporation

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