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XRT72L13IQ Datasheet

  • XRT72L13IQ

  • M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

  • 370頁

  • EXAR   EXAR

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謾莽
APRIL 2001
PRELIMINARY
XRT72L13
REV. P1.0.6
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
GENERAL DESCRIPTION
The XRT72L13 is a fully integrated, low power, Multi-
plexer/Framer IC which performs Multiplexing/De-
mutiplexing of 28 DS1or 21 E1 signals into/from a
DS3 signal with either M13 or C-bit parity frame for-
mat, performs Clear Channel DS3 Framing, and sup-
ports High speed HDLC/LAPD data linking.
The XRT72L13 also contains M12 and M23 bit-inter-
leaving multiplexing/demultiplexing functions with
necessary stuffing and destuffing control. Seven in-
ternal DS2/G.747 framers are included to support
Mux/Demux purposes.
The XRT72L13 contains an integral DS3 Framer
which provides Clear Channel DS3 Framing and Er-
ror Accumulation in accordance with ANSI/ITU-T
specifications.
The XRT72L13 provides the intelligent functions of
DS3/DS2 mode control, signaling control, error and
alarm reporting and handles the HDLC/LAPD data
link through internal registers accessible via an 8-bit
parallel, memory mapped, 碌Processor interface.
FEATURES
鈥?/div>
A fully integrated device that supports:
Multiplexing/Demultiplexing Mode
Clear Channel DS3 Framer Mode
High Speed HDLC Controller Mode
鈥?/div>
Supports Multiple Loop-back modes
鈥?/div>
Smooths gapped clock signals
鈥?/div>
Supports Intel or Motorola PIO 碌P interfaces
鈥?/div>
Available in a 208 pin PQFP package
鈥?/div>
Single 3.3V Power Supply
鈥?/div>
5V Tolerant I/O
鈥?/div>
Operates over the Industrial Temperature Range
APPLICATIONS
鈥?/div>
M13 Multiplexer/Demuliplexer Applications.
鈥?/div>
Frame Relay Systems
鈥?/div>
Digital Access and Cross Connect Systems
鈥?/div>
Local Digital Switch
鈥?/div>
Add/Drop Multiplexers
鈥?/div>
DS3 Data/Channel Service Units.
鈥?/div>
Test Equipment
F
IGURE
1. B
LOCK
D
IAGRAM OF THE
XRT72L13 M
ULTIPLEXER
/F
RAMER
TxHDLC
TxHDLC
Controller
Controller
TxHDLC[0:7]
TxHDLCClk
Send_FCS
TxDS1[0:27]
TxPOS
TxNEG
TxLine Clk
M23
M23
MUX
MUX
M12
M12
MUX
MUX
TxClk[0:27]
Clear Channel
Clear Channel
DS3 Framer
DS3 Framer
RxPOS
RxNEG
RxLine Clk
DS2 or G.747
Data Streams
32/64 Bit
De-Jitter
FIFO
M23
M23
DEMUX
DEMUX
M12
DEMUX
RxDS1[0:27]
RxClk[0:27]
Microprocessor
Microprocessor
Interface
Interface
RxHDLC
RxHDLC
Controller
Controller
RxHdlc[0:7]
RxHDLCClk
RxIdle
Valid-FCS
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
鈥?/div>
www.exar.com

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