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ST70134 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 4 Page - STMicroelectronics

๋ถ€ํ’ˆ๋ช… ST70134
์ƒ์„ธ๋‚ด์šฉ  ASCOT ADSL MODEM CHIP SET FOR CPE
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ST70134 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 4 Page - STMicroelectronics

   
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ST70134 - ST70135A
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Discrete MultiTone Digital Modem (ST70135A)
The DMT
modem has been
developed in
HCMOS6 (0.35
ยตm) technology. It performs PMD
(Physycal Medium Dependant) sub-layer and TC
(Transmission Convergence) sub-layer functions.
In other words we can split the chip into two
separate blocks: the first one which carries out
modem functions (PMD sub layer) and a second
one in charge of ATM framing. The chip is
controlled and programmed by an external
processor and is seen as a memory mapped
device.
MODEM Functions
The modem part of the chip includes all the
necessary blocks
needed for digitally DMT
mapping and demapping. A 14-bit code for every
carrier allows constellations with up to 16383
points. Internally, digital filters carry out Time
Equalization to reduce the effects of the inter
symbol interference. That is followed by Fast
Fourier Transform (in transmit direction an Inverse
FFT is performed) in order to change from time
domain to
frequency domain. Afterwards a
Frequency Equalization cuts down carrier by
carrier the channel distortion, signalโ€™s amplitude
attenuation and phase rotation. By efficient
algorithms,
this
block
drives,
through
the
ST70134โ€™s integrated VCXO controller, the NT
crystal oscillator which comes up in an excellent
synchronisation (less than 2ppm) with ATU-C.
FRAMING Functions
ST70135A performs framing functions for generic
and ATM TC sub layers.
ATM TC sub layer performs cell level functions:
delineation,
idle
cells
or
unassigned
cells
insertion/extraction, payload scrambling, Header
Error Correction (HEC) check and data frame
generation.
ST70135A DMT modem main features:
โ€“ Time-domain equalisation
โ€“ Rotor and frequency-domain equalisation
โ€“ Decimation, interpolation
โ€“ FFT and IFFT
โ€“ Mapping/demapping over 256 carriers
โ€“ Trellis coding and decoding using Viterbi algorithm
โ€“ Error and noise monitoring on individual tones
โ€“ Reed-Solomon encoding and decoding
โ€“ (De) framing and (de) interleaving
โ€“ Cell HEC generation/verification
โ€“ Payload (de) scrambling
โ€“ ATM cell insertion/extraction
โ€“ Idle &/or Unassigned cell insertion/filtering
โ€“ VPI/VCI filtering
โ€“ UTOPIA interface (Level 1 or 2)
โ€“ Microcontroller interface with 16-bit multiplexed
address/data bus and big/little endian format
supported
โ€“ JTAG test port
โ€“ Single 3.3V supply, 1.0W
โ€“ PQFP144 (28 x 28mm body, 0.65mm pitch)
Figure 3 : DMT Modem block diagram
FFT
Rx
DSP FE
DEMAPPER
VITERBI
CELL
BASED
FUNCT.
DE-
FRAMER
Rx
INTERF.
INTERLEAVED
FAST
SIGNAL MONITORING
& FEQ UPDATE & DPLL
ADSL
AFE
PMD SUBLAYER
TC SUBLAYER
ATM (UTOPIA)
IFFT
Tx
DSP FE
MAPPER
VITERBI
R/S
CODER
CELL
BASED
FUNCT.
FRAMER
Tx
INTERF.
FAST
INTERLEAVED
R/S
DECODER


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