XRT7250 datasheet(250/463 Pages) EXAR

250 / 463 page

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

231

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

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

rupt.

Servicing the Receive FEAC Message - Validation

Interrupt.

Whenever the XRT7250 Framer IC generates this in-

terrupt, it will do the following.

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

by driving it "Low".

• It will set Bit 0 (RxFEAC Valid Interrupt Status),

within the RxDS3 FEAC Interrupt Enable/Status

• It will write the contents of this validated FEAC

Message into the Rx DS3 FEAC Register, as indi-

cated below.

Whenever the Terminal Equipment encounters the

Receive FEAC Message - Validation Interrupt, then it

should do the following.

• It should read the contents of the High RxDS3

FEAC Register, and respond accordingly.

4.3.6.2.10 The Receive FEAC Message -

Removal Interrupt

if the Receive FEAC Message - Removal Interrupt is

enabled, then the XRT7250 Framer IC will generate

an interrupt any time the High Receive FEAC Proces-

sor removes a new FEAC (Far-End Alarm & Control)

Message.

In particular, the Receive FEAC Processor will re-

move a FEAC Message, it has received a different

FEAC Message (from the most recently validated

message) in 3 of the last 10 FEAC Message recep-

tions.

Enabling/Disabling the Receive FEAC Message -

Removal Interrupt

The user can enable or disable the Receive FEAC

Message - Removal Interrupt, by writing the appropri-

ate data into Bit 1 (RxFEAC Remove Interrupt En-

able) within the RxDS3 FEAC Interrupt Enable/Status

RXDS3 FEAC INTERRUPT ENABLE/STATUS REGISTER (ADDRESS = 0X17)

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

Not Used

FEAC Valid

RxFEAC

Remove

Interrupt

Enable

RxFEAC

Remove

Interrupt

Status

RxFEAC

Valid

Interrupt

Enable

RxFEAC

Valid

Interrupt

Status

R/W

RUR

R/W

RUR

0000

RXDS3 FEAC INTERRUPT ENABLE/STATUS REGISTER (ADDRESS = 0X17)

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

Not Used

FEAC Valid

RxFEAC

Remove

Interrupt

Enable

RxFEAC

Remove

Interrupt

Status

RxFEAC

Valid

Interrupt

Enable

RxFEAC

Valid

Interrupt

Status

R/W

RUR

R/W

RUR

0000

011

RXDS3 FEAC REGISTER (ADDRESS = 0X16)

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

Not Used

RxFEAC[5:0]

Not Used

R/O

0000

000

XRT7250 Datasheet(PDF) 250 Page - Exar Corporation

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