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STMicroelectronics Electronic Components Datasheet

ST70235A Datasheet

ASCOTTM DMT TRANSCEIVER

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ST70235A
ASCOTTM DMT TRANSCEIVER
PRELIMINARY DATA
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 0.25µm HCMOS7 TECHNOLOGY
s 144 PIN TQFP
s POWER CONSUMPTION: 0.4 WATT
APPLICATIONS
Routers at SOHO, stand-alone modems, PC
modems.
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.
The ST70235A 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 ST70235A is controlled and programmed
by an external controller (ADSL Transceiver Con-
troller, ATC) that sets the programmable coeffi-
cients. The firmware controls the initialization
phase and carries out the consequent adaptation
operations.
TQFP144 Full Plastic
(20 x 20 x 1.40 mm)
ORDER CODE: ST70235A
October 2001
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/28


STMicroelectronics Electronic Components Datasheet

ST70235A Datasheet

ASCOTTM DMT TRANSCEIVER

No Preview Available !

ST70235A
Figure 1 : Block Diagram
TEST SIGNALS
CLOCK
AFE
INTERFACE
AFE
CONTROL
TEST MODULE
DATA SYMBOL TIMING UNIT
VCXO
DSP
FRONT-END
FFT/IFFT
ROTOR
TRELLIS
CODING
MAPPER/
DEMAPPER
GENERIC
TC
REED/
SOLOMON
INTERFACE
MODULE
AFE CONTROL
INTERFACE
CONTROLLER
INTERFACE
ATM
SPECIFIC TC
UTOPIA
CONTROLLER
GENERAL
BUS
PURPOSE I/Os
Transient Energy Capabilities
ESD (Electronic Discharged) tests have been performed for the Human Body Model (HBM) and for the
Charged Device Model (CDM).
The pins of the device are to be able to withstand minimum 2000V for the HBM and minimum 250V for
CDM.
Latch-up
The maximum sink or source current from any pin is limited to 200mA to prevent latch-up.
ABSOLUTE MAXIMUM RATINGS
Symbol
VDD 3.3
VDD 1.8
Ptot
Tamb
Rth J/A
I3.3
I1.8
Parameter
Supply Voltage
Supply Voltage
Total Power Dissipation
Ambient Temperature 1m/s airflow
Thermal Resistivity
Current Consumption
Current Consumption
Min.
3.0
1.62
0
Typ.
3.3
1.8
300
38
Max.
3.6
1.98
400
70
14
135
Unit
V
V
mW
°C
°C/W
mA
mA
2/28


Part Number ST70235A
Description ASCOTTM DMT TRANSCEIVER
Maker ST Microelectronics
Total Page 28 Pages
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