ST70135A Datasheet, PDF (1/29 Pages) STMicroelectronics – ASCOTTM DMT TRANSCEIVER

ST70135A
ASCOT^TM 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
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