STLC60135

DTM modem for 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)
Same chip for both ATU-C and ATU-R
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
0.35mmHCMOS6 Technology
144 pin PQFP package
Power Consumption 1 Watt at 3.3V

The STLC60135 is the DMT modem and ATM framerof theSTMicroelectronics Tosca] chipset.When coupled with STLC60134 analog front-end and an external controller running dedicated firmware,the product fulfils ANSI T1.413 "Issue 2"DMT ADSL specification.

The STLC60135 may be used at both ends of ADSL loop: ATU-C and ATU-R. The chip supports UTOPIA level 1 and UTOPIA level 2 interface and a non ATM synchronous bit-stream interface.

The STLC60135 can be splitted 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 STLC60135 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 adaptationoperations.