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參數(shù)資料
| 型號： | AR-20441-12 |
| 廠商： | Conexant Systems, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:12; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:28; Circular Contact Gender:Pin; Circular Shell Style:Cable Receptacle; Insert Arrangement:28-18 RoHS Compliant: No |
| 中文描述： | AccessRunner ADSL調(diào)制解調(diào)器的PCI設(shè)備的應(yīng)用設(shè)置 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 159K |
| 代理商： | AR-20441-12 |
Controller-less ADSL Modem Device Set for PCI Applications
AccessRunner
Doc. No. 100394B
October 19, 1999
Conexant
Proprietary Information
3
Detailed Description
P46 PCI Bus Interface
The P46 PCI bus interface is the bridge device
between the 11627 ADSL DMT data pump and the
host computer. It provides the control, interface, and
data manipulation for the 11627 data pump, the
20431 AFE, the 20441 line driver, and hybrid
circuitry. It is compliant with the PCI Local Bus
Specification, Revision 2.2 and PCI Bus Power
Management Interface Specification, Version 1.0.
20431 Analog Front End
The 20431 AFE is designed for use in full-rate and
G.lite (G.992.2) ADSL modems. The ADSL AFE
interfaces with the transmit line driver (20441) and
the hybrid receive circuitry on the analog side, and
with the ADSL DMT data pump (11627) on the digital
side. The receive section filters out the unwanted
echo and boosts the wanted signal before
performing an A/D conversion. The transmit section
converts digital data to analog signals and performs
a smoothing operation before presenting the signals
to the line driver.
The 20431 is designed to operate from a 3.3V supply
(nominal), assuming that it is regulated within
±
5%. The
maximum allowable supply voltage is 3.6V.
11627 ADSL DMT Data Pump
The 11627 DMT data pump is a T1.413 Issue 2 and
G.992.1 compliant custom digital signal processing
(DSP) chip built specifically for DMT ADSL
transmission for use in ADSL modems. Brief
descriptions of each functional block within the data
pump are provided in the following sections; refer to
Figure 2.
ATM Transmission Convergence (TC)
In the transmit direction, this block is in charge of
embedding ATM cells into the serial data streams
being fed into the digital interface.
In the receive direction, this block extracts the ATM
cell boundaries from the serial data streams coming
from the digital interface.
To reduce traffic on the PCI bus, the TC block
performs idle cell insertion in the transmit direction
and idle cell deletion and header error correction in
the receive direction.
DSL015002
A
DI
Transmit
Block
DI
Receive
Block
Digital
Interface (DI)
Bit Parser
and QAM
Encoder
QAM
Decoder
and Bit
Parser
AM EncoderDecoder
FEQ
IFFT
FFT
FFT
Transmit
Filter
Time
Domain
Equalizer
ADC
Intf
AFE Interface
DAC
Intf
PCI
Controller
(P46)
Microcontroller
Interface
AFE
(20431)
DMT Data Pump (11627)
EC
Figure 2. AccessRunner 11627 DMT Data Pump Functional Block Diagram
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