XRT91L81

更新时间： 2024-02-24 20:52:35

品牌	Logo	应用领域
艾科嘉 - EXAR		/
页数	文件大小	规格书
40页	255K
描述
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER

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XRT91L81 数据手册

PRELIMINARY

XRT91L81

2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER

JANUARY 2004

REV. P1.0.3

an overflow condition. The operation of the device

can be monitored by checking the status of the

GENERAL DESCRIPTION

The XRT91L81 is a fully integrated SONET/SDH

transceiver block for applications in SONET OC-48

allowing the use of Forward Error Correction (FEC)

capability. The transceiver includes an on-chip Clock

Multiplier Unit (CMU), which uses a high frequency

Phase-Locked Loop (PLL) to generate the high-

speed transmit serial clock from slower external clock

references. It also provides Clock and Data Recovery

(CDR) functions by synchronizing its on-chip Voltage

Controlled Oscillator (VCO) to the incoming serial

data stream. The chip provides serial-to-parallel and

parallel-to-serial converters and 4-bit LVDS system

interfaces in both receive and transmit directions.

The transmit section includes a 4x9 Elastic Buffer

(FIFO) to absorb any phase differences between the

transmitter input clock and the internally generated

transmitter reference clock. In the event of an

overflow, an internal FIFO control circuit outputs an

OVERFLOW indication. The FIFO under the control

of the AUTORST pin can automatically recover from

LOCKDET and LOSDET output signals. An on-chip

phase/frequency detector and charge-pump offers

the ability to form a de-jittering PLL with an external

VCXO that can be used in loop timing mode to clean

up the recovered clock in the receive section.

APPLICATIONS

• SONET/SDH-based Transmission Systems

• Add/Drop Multiplexers

• Cross Connect Equipment

• ATM and Multi-Service Switches, Routers and

Switch/Routers

• DSLAMS

• SONET/SDH Test Equipment

• DWDM Termination Equipment

• Optical Modules and Sub-Systems

FIGURE 1. BLOCK DIAGRAM OF THE XRT91L81

OC-48 TRANSCEIVER

FIFO_RST

FIFO_AUTORST

TxDI0P/N

TxDI1P/N

TxDI2P/N

TxDI3P/N

PISO

(Parallel Input

Serial Output)

TXOP/N

Re-Timer

TXO2P/N

TxCLKIP/N

TXPCLKOP/N

TXCLKO16P/N

CMU

RLOOPP

TXO2DIS

TXO2SEL

TRITXCLKO16

DLOOP RLOOPS

RXI0P/N

RxDO0P/N

RxDO1P/N

RxDO2P/N

RxDO3P/N

SIPO

(Serial Input

Parallel Output)

CDR

RXI1P/N

RXSEL

RxCLKP/N

TRIRXD

REXT

RXCLK16P/N

DISRD

PFD

& Charge Pump

Serial

Microprocessor

Hardware

Control

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

12 3 4 5 6 7...40

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与XRT91L81相关器件

型号	品牌	获取价格	描述	数据表
XRT91L81IB	EXAR	获取价格	2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
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