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Фрагмент инструкции
It supports Nx64 kbps transmission of more than 18,000 feet over 26 AWG copper telephone wire without repeaters. Small size and low power dissipation make the Bt8960 ideal for line-powered voice pairgain systems capable of provid ing four or six clear 64 kbps channels. The Bt8960 is a highly integrated device that includes all of the active circuitry needed for a complete 2B1Q transceiver. In the receive portion of the Bt8960, a variable gain amplifier optimizes the signal level according to the dynamic range of the analog-to-digital converter. Once the signal is digitized, sophisticated adap tive echo cancellation, equalization, and detection DSP algorithms reproduce the originally transmitted far-end signal. In the transmitter, the transmit source and scrambler operation is programma ble via the microcomputer interface. A highly linear digital-to-analog converter with programmable gain, sets the transmission power for optimal performance. A pulse-shaping filter and a low distortion line driver generate the signal character istics needed to drive a large range of subscriber lines at low-bit error rates. Startup and performance monitoring operations are controlled via the micro processor interface. C-language source code supporting these operations is sup plied under a no-fee license agreement from Rockwell. The Bt8960 includes a glueless interface to both Intel and Motorola microprocessors. Functional Block Diagram Variable Analog-Digital Gain to-Digital Signal Amplifier Converter Processor Microcomputer Interface Line Driver Pulse- Shaping Filter Program- mable Gain DAC Framer/ Channel Unit Interface Recovered Analog Data and Receive Clock MPU Bus Transmit Analog Data Transmit Distinguishing Features • Single-chip 2B1Q transceiver solution • All 2B1Q transceiver functions integrated into a single monolithic device – Receiver gain control and A/D converter – DSP functions including echo cancellation, equalization, timing recovery, and symbol detection – Programmable gain transmit DAC, pulse-shaping filter and line driver • Supports operation from 160 to 416 kbps • Capable of transceiving over the ANSI T1.601 and ETSI ETR 080 ISDN test loops • Flexible Monitoring and Control – Glueless interface to Intel 8051 and Motorola 68302 processors – Access to embedded filters, performance meters and timers • Backwards compatible with Bt8952 software API commands • JTAG/IEEE Std 1149.1-1990 compliant • Single +5 V power supply operation • 600 mW power consumption at 288 kbps (typical) • 100-pin PQFP package • –40°C to +85°C operation Applications • Voice/data pairgain systems • Internet connectivity • ISDN basic-rate interface concentrators • ISDN H0 transport • Extended range fractional T1/E1 • Cellular/microcellular base stations • Personal Communications Systems (PCS) radio ports and cell switches Ordering Information Order Number Package Ambient Temperature Bt8960EPF 100-Pin Plastic Quad Flat Pack (PQFP) –40°C to +85°C Copyright © 1997 Rockwell Semiconductor Systems, Inc. All rights reserved. Print date: December 1997 Rockwell Semiconductor Systems, Inc. reserves the right to make changes to its products or specifications to improve performance, reliability, or manufacturability. Information furnished is believed to be accurate and reliable. However, no responsibility is assumed for its use; nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by its implication or otherwise under any patent or intellectual property rights of Rockwell Semiconductor Systems, Inc. Rockwell Semiconductor Systems, Inc. products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a Rockwell Semiconductor Systems, Inc. product can reasonably be expected to result in personal injury or death. Rockwell Semiconductor Systems, Inc. customers using or selling Rockwell Semiconductor Systems, Inc. products for use in such applications do so at their own risk and agree to fully indemnify Rockwell Semiconductor Systems, Inc. for any damages resulting from such improper use or sale. Bt is a registered trademark of Rockwell Semiconductor Systems, Inc. SLC® is a registered trademark of AT&T Technologies, Inc. Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of their respective companies. All other marks mentioned herein are the property of their respective holders. Specifications are subject to change without notice. PRINTED IN THE UNITED STATES OF AMERICA Table of Contents List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix 1.0 System Overview . . . . . . . . . . . . . . . . . . . . . . . . . ...
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