XRT7250 datasheet(98/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

Bit 7 - RxLOF (Receive Loss of Frame) Al-

go(rithm) Select

This Read/Write bit-field permits the user to select

the Receive Loss of Frame Declaration Algorithm, for

the Receive Section of the XRT7250.

Setting this bit-field to "0" configures the Receive

Section to declare a Loss of Frame condition, if it re-

sides in the OOF (Out of Frame) Condition for 24 E3

Frame periods. Likewise, the Receive Section will

clear the Loss of Frame condition, if it resides in the

In-Frame condition for 24 E3 Frame periods.

Setting this bit-field to "1" configures the Receive

Section to declare a Loss of Frame condition, if it re-

sides in the OOF (Out of Frame) condition for 8 E3

Frame periods. Likewise, the Receive Section will

clear the Loss of Frame condition, if it resides in the

In-Frame condition for 8 E3 Frame periods.

NOTE: For more information on the LOF and OOF condi-

tion, please see Section 4.3.2.2.

Bit 6 - RxLOF (Receive Loss of Frame) Status

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

Receive Section of the Framer IC is operating in the

Loss of Frame state.

If this bit-field is set to "0", then the Receive Section is

NOT operating in the Loss of Frame state. Converse-

ly, if this bit-field is set to "1", then the Receive Sec-

tion is operating in the Loss of Frame state.

NOTE: For more information on the "Loss of Frame" State,

please see Section 4.3.2.2.

Bit 5 - RxOOF (Receive Out of Frame) Status

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

Receive Section of the Framer IC is operating in the

Out of Frame state.

If this bit-field is set to "0", then the Receive Section is

NOT operating in the Out of Frame state. Conversely,

if this bit-field is set to "1", then the Receive Section is

operating in the Out of Frame state.

NOTE: For more information on the Out of Frame State,

please see Section 4.3.2.2.

Bit 4 - RxLOS (Receive Loss of Signal) Status

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

Receive Section of the Framer IC is currently declar-

ing an LOS (Loss of Signal) Condition.

If this bit-field is set to "0", then the Receive Section is

NOT declaring a Loss of Signal condition. Converse-

ly, if this bit-field is set to "1", then the Receive Sec-

tion is declaring the Loss of Signal condition.

NOTE: For more information on the Loss of Signal Condi-

tion, please see Section 4.3.2.7.

Bit 3 - RxAIS (Receive Alarm Indication Signal)

Status

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

Receive Section of the Framer IC is currently declar-

ing an AIS (Alarm Indication Signal) Condition.

If this bit-field is set to "0", then the Receive Section is

NOT declaring a AIS condition. Conversely, if this bit-

field is set to "1", then the Receive Section is declar-

ing an AIS condition.

NOTE: For more information on the AIS Condition, please

see Section 4.3.2.8.

Bit 0 - RxFERF (Received Far-End-Receive-Fail-

ure) Status

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

Receive Section of the Framer IC is currently declar-

ing a FERF (Far-End Receive Failure) Condition.

If this bit-field is set to "0", then the Receive Section is

NOT declaring a FERF condition. Conversely, if this

bit-field is set to "1", then the Receive Section is de-

claring an FERF condition.

NOTE: For more information on the FERF Condition, please

see Section 4.3.2.9.

2.3.4.3

Receive E3 Framer Interrupt Enable

RXE3 CONFIGURATION & STATUS REGISTER - 2 (ADDRESS = 0X11)

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

RxLOF

Algo

RxLOF

RxOOF

RxLOS

RxAIS

Not Used

RxFERF

R/W

RORO

RORORORO

1100

111

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