XRT72L13 datasheet(211/370 Pages) EXAR

211 / 370 page

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

PRELIMINARY

REV. P1.0.6

199

If this bit-field is set to “0” then the “PRBS Checker/

Receiver” has not acquired “PRBS Lock” with the

payload portion of the “inbound” DS3 data stream.

Conversely, if this bit-field is set to “1”, then the

“PRBS Checker/Receiver” has acquired “PRBS Lock”

(or Pattern Sync) with the payload portion of the “in-

bound” DS3 data stream.

NOTE: The contents of this bit-field are valid only if the

“PRBS Checker/Receiver” is enabled.

Bit 3 - Rx PRBS Enable

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

the “PRBS Checker/Receiver” block within the

XRT72L13 M13 device.

Setting this bit-field to “0” disables the “PRBS Check-

er/Receiver” block.

Setting this bit-field to “1” enables the “PRBS Check-

er/Receiver” block.

Bit 2 - Tx PRBS Enable

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

or disable the “PRBS Generator/Transmitter” block

within the XRT72L13 M13 device.

Setting this bit-field to “0” disables the “PRBS Gener-

ator/Transmitter” block.

Setting this bit-field to “1” enables the “PRBS Genera-

tor/Transmitter” block.

Bit 1 - RxDS3 Bypass

To be defined in the next revision

Bit 0 - TxDS3 Bypass

To be defined in the next revision

3.3.2.14 Rx DS3 Configuration and Status Reg-

siter

Bit 7 - Rx AIS (Receive AIS Pattern) Indicator

This “Read-Only” bit-field indicates whether or not the

“Receive DS3 Framer” block (within the XRT72L13

M13 device) is currently receiving an AIS pattern or

not.

The XRT72L13 will set this bit-field to “0” if it is not

currently detecting an AIS pattern in the incoming da-

ta stream. Conversely, the XRT72L13 will set this bit-

field to “1” if it is currently receiving an AIS pattern in

the incoming data stream.

NOTE: For a detailed discussion on the AIS pattern please

see Section _.

Bit 6 - Rx LOS (Receive LOS Condition) Indicator

This “Read-Only” bit-field indicates whether or not the

“Receive DS3 Framer” block (within the XRT72L13

M13 device) is currently declaring an LOS (Loss of

Signal) condition of the incoming DS3 data stream.

If this bit-field is set to “0”, then the “Receive DS3

Framer” block (within the chip) is currently not declar-

ing an LOS condition.

If this bit-field is set to “1”, then the “Receive DS3

Framer” block (within the chip) is currently declaring

an LOS condition.

NOTE: For more information on the “LOS Declaration” crite-

ria, please see Section _.

Bit 5 - Rx Idle (Receive Idle Pattern) Indicator

This “Read-Only” bit-field indicates whether or not the

“Receive DS3 Framer” block (within the XRT72L13

M13 device) is currently detecting the “Idle Pattern” in

the “incoming” DS3 data stream.

If this bit-field is set to “0”, then the Receive DS3

Framer block (within the chip) is currently not detect-

ing the Idle pattern.

If this bit-field is set to “1”, then the Receive DS3

Framer block (within the chip) is currently detecting

the Idle pattern.

NOTE: For more information about the “Idle Pattern”,

please see Section _.

Bit 4 - Rx OOF (Receive Out-of-Frame) Indicator

This “Read-Only” bit-field indicates whether or not the

“Receive DS3 Framer” block (within the XRT72L13

RX DS3 CONFIGURATION AND STATUS REGISTER (ADDRESS = 0X10)

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

Rx AIS

Rx LOS

Rx Idle

Rx OOF

Reserved

Framing On

Parity

FSync

Algo

MSync

Algo

R/O

R/W

0000

000

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