XRT95L51 Datasheet, PDF (1/8 Pages) Exar Corporation – OC-48 ATM UNI/POS/MAPPER IC

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PRELIMINARY
XRT95L51
JULY 2000
OC-48 ATM UNI/POS/MAPPER IC
REV. P1.0.1
GENERAL DESCRIPTION
The XRT95L51 is an ATM/PPP physical layer proces-
sor with integrated SONET OC-48/STM-16 framing
controller. ATM direct mapping and cell delineation
are supported, as are PPP mapping and frame pro-
cessing. The XRT95L51 contains an integral SONET
framer which provides framing and error accumula-
tion in accordance with ANSI/ITU-T specifications.
The configuration of this device is done through inter-
nal registers accessible via 8-bit parallel, memory
mapped, microprocessor interface.
The XRT95L51 provides full section, line and path
overhead processing and supports scrambling/de-
scrambling, alarm signal insertion/detection and bit
interleaved parity processing.
The SONET/SDH transmit and receive blocks are
used to transmit/receive an OC-48c/STM-16c signal
or compose and decompose four OC-12/12c sig-
nals.The blocks operate at a peak internal clock
speed of 77 MHz and support 32-bit internal data
paths. The transmit and receive blocks are compliant
with both SONET and SDH standards.
APPLICATIONS
• Digital Cross Connect Systems
• ATM Switches
• Routers
• SONET/SDH Add Drop Multiplexers
• Multiplexers
FEATURES
• Single chip for ATM UNI and Packet over SONET.
• Generates and terminates SONET section, line and
path layers.
• Provides SONET frame scrambling and descram-
bling.
• Provides 32-bit data UTOPIA level II and III multi-
PHY interface and POS-PHY interface.
• 8-bit microprocessor interface
• Includes ATM cell or PPP packet mapping
• Single +3.3V power supply with +5V input tolerance
• -40°C to +85°C Operating Temperature Range
• Available in a 388 pin PBGA package
FIGURE 1. BLOCK DIAGRAM OF THE 95L51 OC-48 ATM UNI/POS/MAPPER IC
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7[/567B/#.20
7[/&ON2#.20
7[5()&ON
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5[/'$7$>48=3@#.20
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5[/&ON3#.20
5[5()&ON
/26
Microprocessor Interface
Overhead
Insertion Block
Tx OC-12
Mapper X4
POH Generation
& Insertion
Parallel to Serial
Tx XCVR I/F
32
Scrambler
POH Processor
SOH Processor
Tx Framer
Serial to Parallel
Rx XCVR I/F
&
32
Byte Align
Rx Framer
SOH Processor
POH Processor
Descrambler
Tx ATM Cell
Processor
Tx POS Cell
Processor
Rx POS Cell
Processor
Rx ATM Cell
Processor
Tx Cell
Buffer
Tx Control
Rx Control
Rx Cell
Buffer
JTAG Test Port
Overhead
Extraction Block
Rx OC-12
MapperX4
POH Extract & Interpret
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5[8(1B/
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5[8&/$9
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com