XRT7250 datasheet(347/463 Pages) EXAR

347 / 463 page

XRT7250

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DS3/E3 FRAMER IC

REV. 1.1.1

328

the RxE3 Interrupt Enable Register - 2, as indicated

below.

Setting this bit-field to “1” enables this interrupt. Con-

versely, setting this bit-field to “0” disables this inter-

rupt.

Servicing the Change in Receive FERF Condition

Interrupt

Whenever the XRT7250 Framer IC detects this inter-

rupt, it will do all of the following.

• It will assert the Interrupt Request output pin (INT),

by driving it “Low”.

• It will set Bit 3 (FERF Interrupt Status), within the

Rx E3 Interrupt Status Register - 2 to “1”, as indi-

cated below.

Whenever the user’s system encounters the Change

in Receive FERF Condition Interrupt, then it should

do the following.

1. It should determine the current state of the FERF

condition. Recall, that this interrupt can be gen-

erated, whenever the XRT7250 Framer IC

declares or clears the FERF defect. Hence, the

user can determine the current state of the LOS

defect by reading the state of Bit 0 (RxFERF)

within the Rx E3 Configuration and Status Regis-

ter - 2, as illustrated below.

5.3.6.2.7

The Detection of BIP-4 Error Interrupt

If the Detection of BIP-4 Error Interrupt is enabled,

then the XRT7250 Framer IC will generate an inter-

rupt, anytime the Receive E3 Framer block has de-

tected an error in the BIP-4 Nibble, within an incom-

ing E3 frame.

NOTE: This interrupt is only active if the XRT7250 Framer

IC has been configured to process the BIP-4 nibble within

each incoming and outbound E3 frame.

RXE3 INTERRUPT ENABLE REGISTER - 2 (ADDRESS = 0X13)

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

Not Used

FERF

Interrupt

Enable

BIP-4 Error

Interrupt

Enable

Framing Error

Interrupt

Enable

Not Used

R/W

000

RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15)

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

Not Used

FERF

Interrupt

Status

BIP-4

Error

Interrupt

Status

Framing

Error

Interrupt

Status

Not Used

RUR

001

000

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

100

111

XRT7250 Datasheet(PDF) 347 Page - Exar Corporation

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