BCM3116 PRODUCT Brief ® BCM3116 B C M 3 1 1 6 QAMLINK F E AT U R E S • Downstream QAM Receiver for North American settop box and DOCSIS cable modem applications. • Integrated QAMLink ® receiver with forward error correction (FEC) • 5.059641/5.360537 MBaud variable symbol rate • Supports 64 and 256-QAM • Digital demodulator, Nyquist filters, tracking loops, and 32-tap adaptive decision feedback equalizer • Digital derotator for wideband carrier phase tracking • ITU-T J.83 Annex B-compliant FEC decoder • 16-state trellis decoder • Reed-Solomon (n,k) = (128,122); t = 3 • Programmable convolutional deinterleaver, I*J <128 with internal RAM, I*J>128 with external RAM ® RECEIVER S U M M A R Y O F B E N E F I T S • Fully integrated, DOCSIS-based solution for cable modems and cable-TV set-top boxes • Enables the industry’s lowest cost, least complex system • Simplifies system, board and software design through the integration of analog components • Reduces power consumption • Enhanced digital adaptive equalization • Robust performance in the presence of multipath at high order QAM constellations • Superior echo cancellation capability for both wired and wireless applications • IC or SPI-compatible microcontroller interface • On-chip generation of all clock and control signals • 3.3V operation • JTAG Test Interface • 100-pin PQFP Interactive Set-top Box with DOCSIS and Watch and Record Dual Video Channels Video 1 DOCSIS 1.1/1.0 Out-of-Band BCM3250 Advanced Single-Chip Set-Top Box Front End Video 1 Video Out PCI BCM7030 High Definition Video/Graphics Subsystem Video 2 Audio Out BCM3116 Video 2 CPU B C M 3 1 1 6 O V E R V I E W Nyquist α =.12,.18 A_IF± 10-Bit A/D 10 4 Phase Recovery and 8-Tap FFE Variable Rate Demod Nyquist α =.12,.18 ITU-T J.83 Annex B FEC Decoder 24-Tap DFE 4 Q cos ωn P_DATA P_CLK P_SYNC P_VALID P_ERR RAM_CTRL sin ωn Deinterleaver RAM AGC_CTRL BAUD_CTRL IF_OSC GEN_CTL Acquisition/Tracking Loops and Clock Generation Phase ROM JTAG MBus/SPI Interface JTAG[3:0] The BCM3116 QAMLink Receiver is a fully asynchronous design with an integrated FEC and 10-bit analog-to-digital converter. It provides a complete digital transmission solution for cable modems, cable-TV set-top boxes and digital microwave radios. Its bandwidth-efficient feature set expands the existing potential bandwidth of a standard analog network and provides operators with reliable, error-free transmission. The BCM3116 accepts a modulated data stream at up to 38.8 Mbps and delivers a demodulated, equalized and error-corrected output data stream. The receiver integrates a 10-bit A/D converter, a 256-QAM demodulator with square-root raisedcosine receive filters, a 32-tap adaptive equalizer with an embedded phase recovery derotator, acquisition and tracking loops, and a forward error correction (FEC) decoder. The FEC is ITU-T J.83 Annex B, DOCSIS, DigiCipher II®, IEEE 802.14, and SCTE DVS-031-compliant. Tuner Control MICRO[3:0] RF[7:0] The analog IF waveform is fed into the chip, where it is sampled by the integrated A/D converter, digitally mixed to baseband and filtered by dual square-root Nyquist filters. Inter-symbol interference is then removed by the adaptive decision feedback equalizer (DFE). A decision slicer, which supports constellations up to 256-QAM, formats the equalized data which is then fed into a trellis decoder, derandomizer, deinterleaver, and ReedSolomon decoder. The final error-corrected output is delivered in non-MPEG or in MPEG-2 transport format. Optimized for high-volume manufacturing, the BCM3116 represents a highly integrated solution that reduces the systemlevel chip count, the cost and the complexity associated with manufacturing RF receivers. Broadcom®, the pulse logo, QAMLink® and Connecting everything® are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other trademarks are the property of their respective owners. ® BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 © 2003 by BROADCOM CORPORATION. All rights reserved. 3116-PB06-R-06.13.03 Phone: 949-450-8700 FAX: 949-450-8710 Email: [email protected] Web: www.broadcom.com