XRT7250 datasheet(415/463 Pages) EXAR

415 / 463 page

XRT7250

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DS3/E3 FRAMER IC

REV. 1.1.1

396

6.3.2.3

Forcing a Reframe via Software Com-

mand

The XRT7250 Framer IC permits the user to com-

mand a reframe procedure with the Receive E3 Fram-

er block via software command. If the user writes a

“1” into Bit 0 (Reframe) within the I/O Control Register

(Address = 0x01), as depicted below, then the Re-

ceive E3 Framer block will be forced into the FA1, FA2

Octet Search state, per Figure 194, and will begin its

search for the “FA1” and “FA2” octets.)

The Framer IC will respond to this command by doing

the following.

1. Asserting both the RxOOF and RxLOF output

pins.

2. Generating both the Change in OOF Status and

the Change in LOF Status interrupts to the Micro-

processor.

3. Asserting both the RxLOF and RxOOF bit-fields

within the Rx E3 Configuration & Status Register,

as depicted below.

6.3.2.4

Performance Monitoring of the Frame

Synchronization Section, within the Receive E3

Framer block

The user can monitor the number of framing bytes

(FA1 and FA2 bytes) errors that have been detected

by the Receive E3 Framer block. This is accom-

PMON FRAMING BIT/BYTE ERROR COUNT REGISTER - MSB (ADDRESS = 0X52)

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

Framing Bit/Byte Error Count - High Byte

RURRUR

RUR

RURRUR

000

PMON FRAMING BIT/BYTE ERROR COUNT REGISTER - LSB (ADDRESS = 0X53)

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

Framing Bit/Byte Error Count - Low Byte

RURRUR

RUR

RURRUR

000

I/O CONTROL REGISTER (ADDRESS = 0X01)

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

Disable TxLOC

LOC

Disable

RxLOC

AMI/

ZeroSup*

Unipolar/Bipo-

lar*

TxLine

Clk

Invert

RxLine

Clk

Invert

Reframe

R/W

100

001

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

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

Rx LOF Algo

RxLOF

RxOOF

RxLOS

RxAIS

RxPld Unstab

TMark

RxFERF

R/W

RORO

RORORORO

111

XRT7250 데이터시트(PDF) 415 Page - Exar Corporation

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