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XRT72L73IB Datasheet

  • XRT72L73IB

  • Telecommunication IC

  • 105頁

  • ETC

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謾莽
DECEMBER 2000
PRELIMINARY
XRT72L73
REV. P1.0.1
THREE CHANNEL, DS3 ATM UNI/CLEAR-CHANNEL FRAMER IC
GENERAL DESCRIPTION
The XRT72L73 Three Channel DS3 ATM User Net-
work Interface (UNI)/Clear Channel Framer is de-
signed to function as either a DS3 ATM UNI or Clear
channel framer. For ATM UNI applications, this de-
vice provides the ATM Physical Layer (Physical Medi-
um Dependent and Transmission Convergence sub-
layers) interface for both the public and private net-
works at DS3 rates. For Clear-Channel framer appli-
cations, this device supports the transmission and re-
ception of 鈥渦ser data鈥?via the DS3 payload bits.
The XRT72L73 incorporates Receive, Transmit, Micro-
processor Interface, Performance Monitor, Test and Di-
agnostic and Line Interface Unit Scan Drive sections.
APPLICATIONS
鈥?/div>
Private User Network Interfaces
鈥?/div>
ATM Switches
鈥?/div>
ATM Concentrators
鈥?/div>
DSLAM Equipment
鈥?/div>
DS3 Frame Relay Equipment
FEATURES
鈥?/div>
Compliant with UTOPIA Level 1 and 2 with 8 or 16
Bit Interface Specification and supports UTOPIA
Bus speeds of up to 50 MHz
鈥?/div>
Contains on-chip 16 cell FIFO in both the Transmit
(TxFIFO) and Receive Directions (RxFIFO)
鈥?/div>
Contains on-chip 54 byte Transmit OAM Cell buffer
and a 108 byte Receive OAM cell buffer, for trans-
mission, reception and processing of OAM cells.
鈥?/div>
Supports PLCP or ATM Direct Mapping modes
鈥?/div>
Supports M13 and C-Bit Parity Framing Formats
鈥?/div>
Supports DS3 Clear Channel Framing Applications
鈥?/div>
Includes PRBS Generator and Receiver
鈥?/div>
Supports Local, Remote-Line, Cell, and PLCP
Loop-backs
鈥?/div>
Interfaces to 8 or 16 Bit wide Motorola and Intel 碌Ps
鈥?/div>
Low power 3.3V, 5V input tolerant, CMOS
鈥?/div>
352 pin PBGA Package
鈥?/div>
1 and 3 channel versions also available
F
IGURE
1. XRT72L73 S
IMPLIFIED
B
LOCK
D
IAGRAM WITH
S
YSTEM
I
NTERFACES
UTOPIA BUS
Level 2
1 of 3 Channels
DS3
XRT72L73
XRT73L03
TxPOS
Tx
UTOPIA
Interface
Tx
Cell
Processor
Tx
PLCP
Processor
Tx
DS3
Framer
44.736 MHz
TxUClav
16
Address
5
3
3
3
TPDATA
TNDATA
TCK
75鈩?coax
TxNEG
TCK
Tx1
ATM
Layer
Processor
Performance
Monitor
LAPD
Transceiver
FEAC
Processor
Microprocessor
Interface
LIU
Interface
Drive
and
Scan
TxLev
DMO
LLOOP
Req
Reset
SDOO
CS
SCLK
Tx2
Rx2
Tx3
Rx3
Ch 2
Ch 3
TAOS
SDI
Address5
16
Rx
UTOPIA
Interface
Rx
Cell
Processor
Rx
PLCP
Processor
Rx
DS3
Framer
RxPOS
RxNEG
3
3
RPOS
RNEG
RCLK1
75鈩?coax
Rx1
RxLineClk
3
RxUClav
DS3/E3 LIU
ATM Switch
25, 33 or 50
MHz
D[15:0]
D[7:0]
A[8:0]
A[10:9]
Channel
Select
WR_RW
4 ALE_AS
RD_DS
RDY_DTCK
Host Mode
Intel/Motorola
碌
碌P
Configuration, Control and Status Monitor
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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