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Exar Corporation

XRT91L81 Datasheet Preview

XRT91L81 Datasheet

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

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PRELIMINARY
XRT91L81
JANUARY 2004
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
REV. P1.0.3
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
an overflow condition. The operation of the device
can be monitored by checking the status of the
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
FIFO_RST
FIFO_AUTORST
TxDI0P/N
TxDI1P/N
TxDI2P/N
TxDI3P/N
TxCLKIP/N
TXPCLKOP/N
TXCLKO16P/N
TRITXCLKO16
OC-48 TRANSCEIVER
WP
RP
RLOOPP
PISO
(Parallel Input
Serial Output)
Re-Timer
CMU
DLOOP RLOOPS
RxDO0P/N
RxDO1P/N
RxDO2P/N
RxDO3P/N
RxCLKP/N
RXCLK16P/N
DISRD
SIPO
(Serial Input
Parallel Output)
CDR
0
1
0
1
Serial
Microprocessor
Hardware
Control
PFD
& Charge Pump
TXOP/N
TXO2P/N
TXO2DIS
TXO2SEL
RXI0P/N
RXI1P/N
RXSEL
TRIRXD
REXT
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XRT91L81 Datasheet Preview

XRT91L81 Datasheet

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

No Preview Available !

XRT91L81
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
REV. P1.0.3
PRELIMINARY
FEATURES
2.488 / 2.666 Gbps Transceiver
Single-chip fully integrated solution containing
parallel-to-serial converter, clock multiplier unit
(CMU), serial-to-parallel converter, limiting amplifier
and clock data recovery (CDR) functions
Host mode serial microprocessor interface
simplifies monitor and control
Selectable full duplex operation between standard
rate of 2.488 Gbps or Forward Error Correction rate
of 2.666 Gbps
4-bit LVDS data paths at 622/666 MHz complies
with OIF SFI-4 Implimentation Agreement
Internal FIFO decouples transmit input and output
clocks
Tx CMU and Rx CDR lock detect
Provides support for dual fiber rings
Integrated limiting amplifier accepts differential
inputs down to 10mVp-p
Separate reference and VCXO input ports support
multiple de-jittering modes
On-chip phase detector and charge pump for
external VCXO based de-jittering PLL
Provides Local, Remote and Split Loop-Back
modes as well as Loop Timing mode
Diagnostics features include various lock detect
functions
Meets Telcordia, ANSI and ITU-T jitter
requirements
Operates at 1.8V with 3.3V I/O
Targeted for SONET OC-48/SDH STM-16 600mW Typical Power Dissipation
Applications
Package: 12 x 12 mm 196-pin STBGA
PRODUCT NUMBER
XRT91L81IB
PRODUCT ORDERING INFORMATION
PACKAGE TYPE
196 STBGA
OPERATING TEMPERATURE RANGE
-40°C to +85°C
2


Part Number XRT91L81
Description 2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
Maker Exar Corporation
Total Page 30 Pages
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