XRT79L71 Datasheet, PDF (2/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L71
REV. P1.0.3
PRELIMINARY
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1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
RECEIVE CELL PROCESSING
• Extraction of ATM cells from PLCP frame or directly
from E3 or DS3 frame
• Termination of PLCP frame
• Supports payload cell de-scrambling
TRANSMIT PACKET PROCESSING
• Inserts PPP packets into data stream
• Maps HDLC data stream directly into DS3 or E3
frame
• Extracts in-band messaging packets
• Supports CRC-16/32, HDLC flag and Idle
sequence generation
RECEIVE PACKET PROCESSING
• Extracts HDLC data stream from DS3 or E3 frame
• Inserts in-band messaging packets
• Detects and removes HDLC flags
UTOPIA/ SYSTEM INTERFACE
• 8/16 bit UTOPIA Level I and II and PPP Multi-PHY
Interface operating at 25, 33 or 50 MHz.
• Compliant with ATM Forum UTOPIA II interface
• Programmable FIFO size for both Transmit and
Receive direction
• Compliant to POS-PHY Level 2 interface
SERIAL INTERFACE
• Serial clock and data interface for accessing DS3/
E3 framer
• Serial clock and data interface for accessing cell/
packet processor
APPLICATIONS
• Digital Access and Cross Connect Systems
• 3G Base Stations
• DSLAMs
• Digital, ATM, WAN and LAN Switches
FIGURE 1. BLOCK DIAGRAM OF THE XRT79L71
R TIP
R R IN G
AGC/
E q u a lize r
TU -3
PCOloHck ^&
P roceDsastoar
Recov ery
Receiver Block
Jitter
A tte n u a to r
Rx DS3/
E3
Fram er
TTIP
T R IN G
E3CLK
DS3CLK
C lk IN
12.288
MHz
Pulse
Shaper
Tim ing
Control
Transm itter Block
Clock
S y n th e s ize r
Jitter
A tte n u a to r
Tx DS3/
E3
Fram er
Microprocessor Interface
PLCP &
O v e rh e a d
HDLC
C o n tro lle r
PLCP &
O v e rh e a d
HDLC
C o n tro lle r
ATM C ell
Processor
or PPP
Processor
U T O P IA /
POS-PHY
In te rfa c e
ATM C ell
Processor
or PPP
Processor
2
U T O P IA /
POS-PHY
In te rfa c e
JTAG Test Port
R e c e iv e
Utopia
POS-PHY
In te rfa c e
Tra n s m it
Utopia
POS-PHY
In te rfa c e
PRODUCT ORDERING INFORMATION
PRODUCT NUMBER
XRT79L71IB
PACKAGE TYPE
17X17 mm 208 Ball Shrink Thin Ball Grid Array
OPERATING TEMPERATURE RANGE
-40°C to +85°C
2