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參數(shù)資料
| 型號： | S5N8952X |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | ADSL Transceiver for NIC |
| 中文描述： | 寬帶收發(fā)信機網(wǎng)卡 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大小： | 212K |
| 代理商： | S5N8952X |
6.
Functional Description
13
S5N8952X
ADSL Transceiver for NIC
Preliminary Information (Rev.2.0)
The ADSL modem for customer premises consists of two main chips; ADSL transceiver
chip (S5N8952) and analog front-end chip (S5N8951). The analog front-end provides an
analog interface with line drivers and hybrid components for connecting to the PSTN. The
ADSL Transceiver provides all the digital functions as depicted in Figure 4.
DMT inherently transmits an optimized time-variable spectrum. This spectrum is adjusted
according to the desired data rate and the transmission characteristics (transfer function
and noise spectrum) on each and every subchannel. For this, CO and CPE transmit 256
4kHz-wide tone downstream and upstream respectively to each other during initialization.
They measure the quality of each of these received tones and then decide whether a tone
has sufficient quality to be used for further transmission and, if so, how much data this
tone should carry relative to the other tones that are used. They inform the bit loading
informations to each other.
In FDM-based DMT (Discrete MultiTone) modulation, the frequency band, 0 to 1.104MHz,
is divided into 256 equi-spaced subchannels with 4.3125KHz tone spacing. The frequency
band, 26KHz (#6) to 134KHz (#31) is used for the upstream, and 142KHz (#33) to
1.1MHz (#255) for the downstream.
The S5N8952 provides PCI bus interface for NIC application and 14-bit AD/DA interface.
SAR (Segmentation and Reassembly) and ATM TC (Transmission Convergence) are
implemented for ATM cell handling and especially on-chip hardware SAR provides more
processing power by reducing the PCI bus traffic than the software SAR. Reed-Solomon
error correction with/without interleaver and Trellis coded modulation increase channel
noise immunity. Time/frequency-domain equalizers, echo canceller, and digital filters, of
which coefficients are adaptively updated according to the channel conditions, enhance
the performance of data recovery.
Figure 4: Functional Block Diagram of the S5N8952X
PCI
TEAKLITE
DSP
SAR
ATM
TC
FRAMER/
RS CODEC
TCM/
VITERBI/
QAM CODEC
FFT/IFFT/
ROTER
TEQ/FEQ/
FILTER/
ECHO
PCI_BUS
RAM
ROM
ANALOG
FRONT_END
HOST
I/F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S5-P | 制造商:TURCK Inc 功能描述:Relay, Socket, Releco S5-P, 3 Pole, 11 Contact, PCB Mount, R4518 |
| S5P2470X53-YA4M | 制造商:Samsung Semiconductor 功能描述:ARM9 533MHz with Sipix EPD T-CON,330-FBGA(14x14mm) 0.65mm Ball pitch |
| S5PF30L | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:P-channel 30V - 0.045OHM - 5A SO-8 STripFET TM Power MOSFET |
| S5PHQ-0U-GXMA72C2-BB | 制造商:BittWare 功能描述: |
| S5PJ_1GNS WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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