XRT7250 datasheet(87/463 Pages) EXAR

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XRT7250

DS3/E3 FRAMER IC

áç

REV. 1.1.1

Payload Type value (within the MA Byte-Field) in the

last 5 consecutive incoming E3 frames.

If the Receive E3 Framer has detected a change in

the Payload Type value, within the last 5 incoming E3

frames, then it will set this bit-field to "1". If the Pay-

load Type value has been consistent in the last 5 E3

frames, then the Receive E3 Framer will set this bit-

field to "0".

Bit 1 - Rx TMark

This Read-Only bit-field reflects the most recently val-

idated Timing Marker value. The Receive E3 Framer

will validate the Timing Marker state, after it has de-

tected a user-selectable number of consecutive in-

coming E3 frames with a consistent Timing Marker

value. The user makes this selection by writing the

appropriate value to Bit 3 (RxTMarkAlgo) within the

Rx E3 Configuration/Status Register (Address =

0x0E).

Bit 0 - RxFERF (Far End Receive Failure)

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

Receive E3 Framer is experiencing an FERF (Far-

End-Receive-Failure) condition. The Receive E3

Framer will declare a FERF condition, if it has re-

ceived a user-selectable number of consecutive E3

frames, with the FERF bit-field (within the MA byte)

set to "1". This user-selectable number is either 3 or

5 E3 frames. Conversely, the Receive E3 Framer will

negate the FERF declaration, if it has received this

user-selectable number of consecutive E3 frames,

with the FERF bit-field set to "0".

If this bit-field is set to "1", then the Receive E3 Fram-

er has declared an FERF condition. If this bit-field is

set to "0", then the Receive E3 Framer has not de-

clared an FERF condition.

NOTE: Please see Section 5.1.1.4, for a more detailed dis-

cussion on the meaning of the FERF bit-field, within the E3

frame.

2.3.3.3

3.3.2.17 Receive E3 Interrupt Enable

Bit 4 - Change of Frame Alignment (COFA) Inter-

rupt Enable

This Read/Write bit-field allows the user to enable or

disable the Change of Frame Alignment interrupt.

Setting this bit-field to "1" enables this interrupt. Set-

ting this bit-field to "0" disables this interrupt.

Bit 3 - OOF (Out of Frame) Interrupt Enable

This Read/Write bit field allows the user to enable or

disable the Change in Out-of-Frame (OOF) status in-

terrupt. Setting this bit-field to "1" enables this inter-

rupt. Setting this bit-field to "0" disables this interrupt.

NOTE: For more information on the OOF Condition, please

see Section 5.3.2.1.

Bit 2 - LOF (Loss of Frame) Interrupt Enable

This Read/Write bit-field allows the user to enable or

disable the Change in Loss-of-Frame (LOF) status in-

terrupt. Setting this bit-field to "1" enables this inter-

rupt. Setting this bit-field to "0" disables this interrupt.

For more information on the LOF Condition, please

see Section 5.3.2.1.

Bit 1 - LOS (Loss of Signal) Interrupt Enable

This Read/Write bit-field allows the user to enable or

disable the Change in LOS condition interrupt. Set-

ting this bit-field to "1" enables this interrupt. Setting

this bit-field to "0" disables this interrupt.

NOTE: For more information on the LOS Condition, please

see Section 5.3.2.6.

Bit 0 - AIS Interrupt Enable

This Read/Write bit-field allows the user to enable or

disable the Change in AIS condition interrupt. Setting

this bit-field to "1" enables this interrupt. Setting this

bit-field to "0" disables this interrupt.

NOTE: For more information on the AIS Condition, please

see Section 5.3.2.6.2.

RXE3 INTERRUPT ENABLE REGISTER - 1 (ADDRESS = 0X12)

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

Not Used

COFA

Interrupt

Enable

OOF

Interrupt

Enable

LOF

Interrupt

Enable

LOS

Interrupt

Enable

AIS

Interrupt

Enable

R/W

000

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