XRT7250 datasheet(343/463 Pages) EXAR

343 / 463 page

XRT7250

áç

DS3/E3 FRAMER IC

REV. 1.1.1

324

the RxE3 Interrupt Enable Register - 1, 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 OOF 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 (OOF Interrupt Status), within the Rx

E3 Interrupt Status Register - 1 to “1”, as indicated

below.

Whenever the user’s system encounters the Change

in Receive OOF Condition Interrupt, then it should do

the following.

1. It should determine the current state of the OOF

condition. Recall, that this interrupt can be gen-

erated, whenever the XRT7250 Framer IC

declares or clears the OOF defect. Hence, the

user can determine the current state of the LOS

defect by reading the state of Bit 5 (RxOOF)

within the Rx E3 Configuration and Status Regis-

ter - 2, as illustrated below.

If the OOF state is TRUE

1. It should transmit a FERF (Far-End-Receive Fail-

ure) indicator to the Remote Terminal Equipment.

Please see Section 4.2.4.2.1.3 on how to config-

ure the XRT7250 to transmit the FERF indicator

to the Remote Terminal Equipment.

If the OOF state is FALSE

1. It should cease transmitting the FERF indication

to the Remote Terminal Equipment. Please see

Section 4.2.4.2.1.3 on how to control the state of

the “A” bit, which is transmitted via each out-

bound E3 frame.

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

0X0X0

RXE3 INTERRUPT STATUS REGISTER - 1 (ADDRESS = 0X14)

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

Not Used

COFA

Interrupt

Status

OOF

Interrupt

Status

LOF

Interrupt

Status

LOS

Interrupt

Status

AIS

Interrupt

Status

RUR

01000

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

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

RxLOF Algo

RxLOF

RxOOF

RxLOS

RxAIS

RxPld Unstab

TMark

RxFERF

R/W

RORO

RORORORO

XXXX

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