器件名称: ST70135
功能描述: ASCOTTM DMT TRANSCEIVER
文件大小: 198.94KB 共29页
简 介: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) 1 & 2) OR BITSTREAM INTERFACE 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.
s SUPPORTS EITHER ATM (UTOPIA LEVEL s 16 BIT MULTIPLEXED MICROPROCESSOR
INTERFACE (LITTLE AND BIG ENDIAN COMPATIBILITY)
s ANALOG FRONT END MANAGEMENT s DUAL
LATENCY INTERLEAVED PA……
