GENERAL DESCRIPTION
The ST70235A 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.

■ 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 1 & 2) OR BITSTREAM INTERFACE
■ 16 BIT MULTIPLEXED MICROPROCESSOR INTERFACE (LITTLE AND BIG ENDIAN COMPATIBILITY)
■ ANALOG FRONT END MANAGEMENT
■ DUAL LATENCY PATHS: FAST AND INTERLEAVED
■ ATM’S PHY LAYER: CELL PROCESSING (CELL DELINEATION, CELL INSERTION, HEC)
■ ADSL’S OVERHEAD MANAGEMENT
■ REED SOLOMON ENCODE/DECODE
■ TRELLIS ENCODE/DECODE (VITERBI)
■ DMT MAPPING / DEMAPPING OVER 256 CARRIERS
■ FINE (2PPM) TIMING RECOVER USING ROTOR AND ADAPTATIVE FREQUENCY DOMAIN EQUALIZING
■ TIME DOMAIN EQUALIZATION
■ FRONT END DIGITAL FILTERS
■ 0.25µm HCMOS7 TECHNOLOGY
■ 144 PIN TQFP
■ POWER CONSUMPTION: 0.4 WATT

APPLICATIONS
   Routers at SOHO, stand-alone modems, PC modems.