XRT72L13 datasheet(124/370 Pages) EXAR

124 / 370 page

XRT72L13

MULTIPLEXER/FRAMER IC

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PRELIMINARY

REV. 1.0.6

112

Bit 5 - Insert AIS Rx DS1 Channel 25

This “Read/Write” bit-field permits the user to config-

ure the contents of the “inbound” DS1 Channel 25 to

be overwritten with an “All Ones” pattern.

Setting this bit-field to “0” permits data to be output

(via the RxDS1Data25 output pin), as demultiplexed

via the inbound DS2 and DS3 data streams.

Bit 4 - Insert AIS Rx DS1 Channel 24

This “Read/Write” bit-field permits the user to config-

ure the contents of the “inbound” DS1 Channel 24 to

be overwritten with an “All Ones” pattern.

Setting this bit-field to “0” permits data to be output

(via the RxDS1Data24 output pin), as demultiplexed

via the inbound DS2 and DS3 data streams.

Bit 3 - Insert AIS Tx DS1 Channel 27

This “Read/Write” bit-field permits the user to config-

ure the contents of the “outbound” DS1 Channel 27 to

be overwritten with an “All Ones” pattern.

Setting this bit-field to “0” permits the contents of DS1

Channel 27 to be transmitted as received (via the

TxDS1Data27 input pin).

Setting this bit-field to “1” configures the XRT72L13

M13 device to overwrite this data with an AIS (all

ones pattern).

Bit 2 - Insert AIS Tx DS1 Channel 26

This “Read/Write” bit-field permits the user to config-

ure the contents of the “outbound” DS1 Channel 26 to

be overwritten with an “All Ones” pattern.

Setting this bit-field to “0” permits the contents of DS1

Channel 26 to be transmitted as received (via the

TxDS1Data26 input pin).

Setting this bit-field to “1” configures the XRT72L13

M13 device to overwrite this data with an AIS (all

ones pattern).

Bit 1 - Insert AIS Tx DS1 Channel 25

This “Read/Write” bit-field permits the user to config-

ure the contents of the “outbound” DS1 Channel 25 to

be overwritten with an “All Ones” pattern.

Setting this bit-field to “0” permits the contents of DS1

Channel 25 to be transmitted as received (via the

TxDS1Data25 input pin).

Setting this bit-field to “1” configures the XRT72L13

M13 device to overwrite this data with an AIS (all

ones pattern).

Bit 0 - Insert AIS Tx DS1 Channel 24

This “Read/Write” bit-field permits the user to config-

ure the contents of the “outbound” DS1 Channel 24 to

be overwritten with an “All Ones” pattern.

Setting this bit-field to “0” permits the contents of DS1

Channel 24 to be transmitted as received (via the

TxDS1Data24 input pin).

Setting this bit-field to “1” configures the XRT72L13

M13 device to overwrite this data with an AIS (all

ones pattern).

2.3.2.38 M12 DS2 # 1 Loopback Request Regis-

ter )

Bit 7 - Loop-back Activation - DS1 Channel 3

This “Read/Write” bit-field permits the user to config-

ure DS1 Channel 3 into Remote Loop-back Mode.

When this loop-back is configured, then the

“RxDS1Data_3” signal will internally be “looped-back”

into the “TxDS1Data_3” path. Further, the

“RxDS1Clock_3” clock signal will also be internally

looped back into the “RxDS1Clock_3” signal path.

Setting this bit-field to “1” enables this loop-back

mode. Conversely, setting this bit-field to “0” disables

this loop-back mode.

NOTE: This bit-field is ignored if the XRT72L13 has been

configured to operate in the “ITU-T G.747” Mode.

Bit 6 - Loop-back Activation - DS1 Channel 2

This “Read/Write” bit-field permits the user to config-

ure DS1 Channel 2 into Remote Loop-back Mode.

When this loop-back is configured, then the

“RxDS1Data_2” signal will internally be “looped-back”

into the “TxDS1Data_2” path. Further, the

“RxDS1Clock_2” clock signal will also be internally

looped back into the “RxDS1Clock_2” signal path.

M12 DS2 # 1 LOOP-BACK REGISTER (ADDRESS = 0X28)

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

Loop-back

Activation

DS1 Channel

Loop-back

Activation

DS1 Channel

Loop-back

Activation

DS1 Channel

Loop-back

Activation

DS1 Channel

Loop-back

Request

DS1 Channel

Loop-back

Request

DS1 Channel

Loop-back

Request

DS1 Channel

Loop-back

Request

DS1 Channel

R/W

000

XRT72L13 Datasheet(PDF) 124 Page - Exar Corporation

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