XRT72L13 datasheet(104/370 Pages) EXAR

104 / 370 page

XRT72L13

MULTIPLEXER/FRAMER IC

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PRELIMINARY

REV. 1.0.6

Bit 1 - RxDS3 Bypass

To be defined in the next revision

Bit 0 - TxDS3 Bypass

To be defined in the next revision

2.3.2.15 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

M13 device) is currently declaring an “OOF” (Out of

Frame) condition.

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

Framer” block (of the chip) is currently not declaring

the “OOF” condition.

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

Framer block is currently declaring the “OOF” condi-

tion.

NOTE: For more information on the “OOF” and “In-Frame”

Declaration Criteria (for DS3) please see Section _.

Bit 2 - Framing On Parity ON/OFF Select

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

that the “Receive DS3 Framer” block include P-Bit

Verification as a condition for declaring itself “In-

Frame”, during “Frame Acquisition”.

This feature also imposes an additional “Frame Main-

tenance” requirement on the “Receive DS3 Framer”

block. In particular, if this additional requirement is

implemented, the “Receive DS3 Framer” block will

perform a frame search if it detects P-bit errors in at

least 2 out of 5 DS3 frames.

Setting this bit-field to “1” imposes this additional re-

quirement.

Conversely, setting this bit-field to “0” configures the

“Receive DS3 Framer” block to waive this require-

ment.

NOTE: For more information on “Framing with Parity”,

please see Section _.

Bit 1 - FSync Algo(rithm) Select

This “Read/Write” bit-field, in conjunction with Bits 0

and 2 of this register, allows the user to completely

define the “Frame Maintenance” criteria of the “Re-

ceive DS3 Framer” block (within the chip). This par-

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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