ST70135

更新时间： 2024-11-22 22:42:39

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		/
页数	文件大小	规格书
29页	199K
描述
ASCOTTM DMT TRANSCEIVER

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中文翻译

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数据手册

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ST70135 数据手册

ST70135A

ASCOT^TMDMT TRANSCEIVER

■ 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)

■ SUPPORTS EITHER ATM (UTOPIA LEVEL

PQFP144

1 & 2) OR BITSTREAM INTERFACE

ORDERING NUMBER:

ST70135A

■ 16 BIT MULTIPLEXED MICROPROCESSOR

INTERFACE (LITTLE AND BIG ENDIAN

COMPATIBILITY)

APPLICATIONS

Routers at SOHO, stand-alone modems, PC

modems

■ ANALOG FRONT END MANAGEMENT

■ DUAL LATENCY PATHS: FAST AND

GENERAL DESCRIPTION

INTERLEAVED

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.

■ ATM’S PHY LAYER: CELL PROCESSING

(CELL DELINEATION, CELL INSERTION,

HEC)

■ ADSL’S OVERHEAD MANAGEMENT

■ REED SOLOMON ENCODE/DECODE

■ TRELLIS ENCODE/DECODE (VITERBI)

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.

■ DMT MAPPING/ DEMAPPING OVER 256

CARRIERS

■ FINE (2PPM) TIMING RECOVER USING

ROTOR AND ADAPTATIVE FREQUENCY

DOMAIN EQUALIZING

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.

■ TIME DOMAIN EQUALIZATION

■ FRONT END DIGITAL FILTERS

■ 0.35µm HCMOS6 TECHNOLOGY

■ 144 PIN PQFP PACKAGE

The firmware controls the initialization phase and

carries out the consequent adaptation operations.

■ POWER CONSUMPTION 1 WATT AT 3.3V

April 2000

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与ST70135相关器件

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