XRT7250 datasheet(348/463 Pages) EXAR

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XRT7250

DS3/E3 FRAMER IC

REV. 1.1.1

329

Enabling and Disabling the Detection of FEBE

Event Interrupt

The user can enable or disable the Detection of BIP-4

Error’ interrupt by writing the appropriate value into

Bit 2 (BIP-4 Interrupt Enable) within the Rx E3 Inter-

rupt 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 Detection of the BIP-4 Error Inter-

rupt

Whenever the XRT7250 Framer IC detects this inter-

rupt, it will do the following.

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

by driving it “High”.

• It will set the Bit 2 (BIP-4 Interrupt Status), within

the RxE3 Interrupt Status Register - 2 as indicated

below.

Whenever the Terminal Equipment encounters the

Detection of BIP-4 Error Interrupt, it should do the fol-

lowing.

• It should read the contents of the PMON Parity

Error Event Count Registers (located at Addresses

0x54 and 0x55) in order to determine the number of

BIP-4 Errors that have been received by the

XRT7250 Framer IC.

5.3.6.2.8

The Detection of Framing Error Inter-

rupt

If the Detection of Framing Error Interrupt is enabled,

then the XRT7250 Framer IC will generate an inter-

rupt, anytime the Receive E3 Framer block has re-

ceived an E3 frame with an incorrect FAS pattern val-

ue.

Enabling and Disabling the Detection of FEBE

Event Interrupt

The user can enable or disable the Detection of

Framing Error’ interrupt by writing the appropriate val-

ue into Bit 1 (Framing Error Interrupt Enable) within

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

0000

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

0000

100

XRT7250 Datasheet(PDF) 348 Page - Exar Corporation

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