XRT7250 datasheet(423/463 Pages) EXAR

423 / 463 page

XRT7250

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DS3/E3 FRAMER IC

REV. 1.1.1

404

The user can determine the number of BIP-8 Errors

that have been detected by the Receive E3 Framer

block, since the last read of these registers. These

registers are reset-upon-read.

6.3.2.8

Processing of the Far-End-Block Error

(FEBE) Bit-fields

Whenever the Receive E3 Framer detects an error in

the incoming E3 frame, via EM byte verification, it will

inform the Local Transmit E3 Framer of this fact. The

Local Transmit E3 Framer will, in turn, notify the Re-

mote Terminal (e.g., the source of the errored E3

frame) by transmitting an E3 frame, with the FEBE

bit-field (within the MA byte) set to “1”.

If the Receive E3 Framer receives any E3 frame, with

the FEBE bit-field set to “1”, then it will do the follow-

ing.

• It will generate a FEBE Event interrupt to the Micro-

processor/Microcontroller. Hence, the Receive E3

Framer block will set bit 4 (FEBE Interrupt Status)

within the Rx E3 Framer Interrupt Status Register -

2, as depicted below.

• Increment the PMON Received FEBE Event Count

0x57 in the Framer Address space. The byte-for-

mat of these registers are presented below.

The user can determine the total number of FEBE

Events (e.g., E3 frames that have been received with

PMON PARITY ERROR COUNT REGISTER - LSB (ADDRESS = 0X55)

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

Parity Error Count - Low Byte

RURRUR

RUR

RURRUR

000

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

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

Not Used

TTB Change

Interrupt Status

Not Used

FEBE Interrupt

Status

FERF Interrupt

Status

BIP-8 Error

Interrupt Status

Framing Byte

Error Interrupt

Status

RxPld Mis

Interrupt Status

RUR

000

PMON FEBE EVENT COUNT REGISTER - MSB (ADDRESS = 0X56)

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

FEBE Event Count - High Byte

RURRUR

RUR

RURRUR

000

PMON FEBE EVENT COUNT REGISTER - LSB (ADDRESS = 0X57)

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

FEBE Event Count - Low Byte

RURRUR

RUR

RURRUR

000

XRT7250 Datasheet(PDF) 423 Page - Exar Corporation

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