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AR-20431 Datasheet(PDF) 3 Page - Synaptics Incorporated. |
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AR-20431 Datasheet(HTML) 3 Page - Synaptics Incorporated. |
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3 / 24 page  Controller-less ADSL Modem Device Set for PCI Applications AccessRunner Doc. No. 100394B Conexant 3 October 19, 1999 Proprietary Information 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 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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