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STMicroelectronics Electronic Components Datasheet

ST70135A Datasheet

ASCOTTM DMT TRANSCEIVER

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ST70135A
ASCOTTM DMT TRANSCEIVER
s DMT MODEM FOR CPE ADSL,
COMPATIBLE WITH THE FOLLOWING
STANDARDS:
- ANSI T1.413 ISSUE 2
- ITU-T G.992.1 (G.DMT)
- ITU-T G.992.2 (G.LITE)
s SUPPORTS EITHER ATM (UTOPIA LEVEL
1 & 2) OR BITSTREAM INTERFACE
s 16 BIT MULTIPLEXED MICROPROCESSOR
INTERFACE (LITTLE AND BIG ENDIAN
COMPATIBILITY)
s ANALOG FRONT END MANAGEMENT
s DUAL LATENCY PATHS: FAST AND
INTERLEAVED
s ATM’S PHY LAYER: CELL PROCESSING
(CELL DELINEATION, CELL INSERTION,
HEC)
s ADSL’S OVERHEAD MANAGEMENT
s REED SOLOMON ENCODE/DECODE
s TRELLIS ENCODE/DECODE (VITERBI)
s DMT MAPPING/ DEMAPPING OVER 256
CARRIERS
s FINE (2PPM) TIMING RECOVER USING
ROTOR AND ADAPTATIVE FREQUENCY
DOMAIN EQUALIZING
s TIME DOMAIN EQUALIZATION
s FRONT END DIGITAL FILTERS
s 0.35µm HCMOS6 TECHNOLOGY
s 144 PIN PQFP PACKAGE
s POWER CONSUMPTION 1 WATT AT 3.3V
PQFP144
ORDERING NUMBER:
ST70135A
APPLICATIONS
Routers at SOHO, stand-alone modems, PC
modems
GENERAL DESCRIPTION
The ST70135A is the DMT modem and ATM
framer of the STMicroelectronics ASCOT
chipset. When coupled with ST70134 analog
front-end and an external controller running
dedicated firmware, the product fulfills ANSI
T1.413 ”Issue 2” DMT ADSL specification.
The chip supports UTOPIA level 1 and UTOPIA
level 2 interface and a non ATM synchronous
bit-stream interface.
The ST70135A can be split up into two different
sections. The physical one performs the
DMT modulation, demodulation, Reed-Solomon
encoding, bit interleaving and 4D trellis coding.
The ATM section embodies framing functions for
the generic and ATM Transmission Convergence
(TC) layers.
The generic TC consists of data scrambling and
Reed Solomon error corrections, with and without
interleaving. The ST70135A is controlled and
programmed by an external controller (ADSL
Transceiver Controller, ATC) that sets the
programmable coefficients.
The firmware controls the initialization phase and
carries out the consequent adaptation operations.
April 2000
1/29


STMicroelectronics Electronic Components Datasheet

ST70135A Datasheet

ASCOTTM DMT TRANSCEIVER

No Preview Available !

ST70135A
Figure 1 : Block Diagram
TEST SIGNALS
CLOCK
AFE
INTERFACE
AFE
CONTROL
TEST MODULE
DATA SYMBOL TIMING UNIT
VCXO
DSP
FRONT-END
FFT/IFFT
ROTOR
TRELLIS
CODING
MAPPER/
DEMAPPER
GENERIC
TC
REED/
SOLOMON
INTERFACE
MODULE
AFE CONTROL
INTERFACE
CONTROLLER
INTERFACE
ATM
SPECIFIC TC
STM
UTOPIA
CONTROLLER
GENERAL
BUS PURPOSE I/Os
TRANSIENT ENERGY CAPABILITIES
ESD
ESD (Electronic Discharged) tests have been
performed for the Human Body Model (HBM) and
for the Charged Device Model (CDM). The pins of
ABSOLUTE MAXIMUM RATINGS
the device are to be able to withstand minimum
2000V for the HBM and minimum 250V for CDM.
Latch-up
The maximum sink or source current from any pin
is limited to 200mA to prevent latch-up.
Symbol
VDD
Ptot
Tamb
Parameter
Supply Voltage
Total Power Dissipation
Ambient Temperature 1m/s airflow
Minim um
3.0
0
Typical
3.3
900
Maximum
3.6
1400
70
Unit
V
mW
°C
2/29


Part Number ST70135A
Description ASCOTTM DMT TRANSCEIVER
Maker ST Microelectronics
Total Page 29 Pages
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