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| BCM3250 (R) BCM3250 QAMLINK(R) ADVANCED SET-TOP BOX SINGLE-CHIP FRONT-END FEATURES SUMMARY OF BENEFITS * Two complete QAMLink variable symbol rate receivers (in- * * * * * * Direct interface to VoIP DSP band video and DOCSIS/EuroDOCSIS IP data receive channels) * Dual 10-bit A/D converters with input AGC amplifiers * Dual 1-7 Mbaud 256-QAM receivers * Dual ITU-T J.83 Annex A/B/C compatible FEC decoders QPSK out-of-band receiver * 100 - 200 MHz LO with AGC and 6-bit A/D converter * DigiCipher II(R)/DVB/DAVIC FEC decoder Upstream QPSK/16-QAM transmitter * 0 - 65 MHz direct RF output * Programmable Starvue II/DOCSIS/EuroDOCSIS/DVB/DAVIC FEC encoder * 10-bit D/A converter with output power control interfaces DOCSIS/EuroDOCSIS media access controller (MAC) * DOCSIS/EuroDOCSIS version 1.1 based * Extensions for fragmentation and concatenation * Support for enhanced Quality of Service (QoS) for Voice over IP (VoIP) applications DAVIC media access controller (MAC) * DAVIC 1.2/1.5 compliant * Support for 1.5 Mbps and 3 Mbps on both upstream and downstream * Parsing, CRC, and ATM cell extraction * Hardware SAR engine Both processor interface and PCI 2.2 * Represents a complete solution for interactive set-top box * * * * front-end, including cable modem functions. * Universal front-end supports the ITU-T J.83 Annex A/B/C as well as OpenCable, DOCSIS/EuroDOCSIS and DVB/DAVIC. * DOCSIS/EuroDOCSIS 1.1-based media access controller (MAC) supports Voice over IP and high-speed Internet access capability. * DAVIC 1.2/1.5 MAC supports conditional access systems and lower data rate services. * BCM3250, together with BCM7020/BCM7030 Video Decoder and Graphics Engine, provide a two-chipset solution for OpenCable applications. Includes second in-band channel pass through for picture-inpicture functionality and multiple camera angles. Integration of all analog functions leads to lower system cost and improved performance. Single upstream transmitter is shared between modem and upstream interactive video commands, eliminating the need for a second upstream channel. Integrated peripheral control unit supports required set-top box peripherals without additional external devices. Interactive Set-Top Box System Block Diagram Analog V ideo Cable Plant Dual Tuner with Diplex Filter IP Data Channel Video Channel Out-of-Band Channel BCM3250 QAMLink(R) Advanced Set-top Box Single-Chip Front-End BCM7038 Dual HD decoder MIPS64 microprocessor Transport/Graphics Subsystem Peripherals Video O ut Audio O ut Upstream T ransmitter CPU V.90 S oft Modem Codec I/O OVERVIEW IRTx IRRx LEDC KBDC TXn RXn JTAG JTAG TUN_CTL Tuner Interface IR Tx/Rx Interface LED Interface Variable Interpolator Keypad Interface Nyquist DUART JTAG SPI Master PCI 2.2/ Microcontroller Interface Upstream DAVIC 1.2/1.5 Tx MAC Address, Data, Control 0-65 MHz 10-Bit D/A DDS Variable Interpolator Nyquist PreEqualizer Starvue ITU-T J.83 Annex B DAVIC FEC POD I/F External Input to US Modulator Variable Interpolator 36/44 MHz Nyquist 10-Bit A/D = .12-.18 DDS Variable Interpolator 1 Phase Recovery and 40-Tap DFE ITU-T J.83 Annex A/B/C FEC DOCSIS 1.1 MAC DMA and SDRAM Controller Direct Connection to SDRAM Acquisition and Tracking Loops Variable Interpolator 36/44 MHz IB1 MPEG-2 Transport Stream 10-Bit A/D = DDS Variable Interpolator Phase Recovery and 40-Tap DFE ITU-T J.83 Annex A/B/C FEC PID Filter IB2 MPEG-2 Transport Stream IB/OB Acquisition and Tracking Loops Variable Interpolator 36/50 MHz Nyquist 6-Bit A/D = .30-.50 DDS Variable Interpolator Nyquist = .30-.50 4-Tap Equalizer OOB DCII DAVIC FEC 100-200 MHz Agile PLL DAVIC 1.2/1.5 RX MAC and Message Processor POD I/F OOB Output Stream The Broadcom BCM3250 combines dual 256-QAM receivers, a 4/16QAM burst transmitter, an out-of-band QPSK receiver, a DOCSIS/ EuroDOCSIS 1.1 based MAC, and a DAVIC 1.2/1.5 compliant MAC integrated into a single chip. The BCM3250 is the world's first complete front-end solution with an integrated DOCSIS/EuroDOCSIS 1.1 MAC to address the next generation of OpenCable/interactive set-top boxes. Quality of Service (QoS) and fragmentation are supported for additional applications, such as telephony and high-speed Internet access. The dual receivers in the BCM3250 directly sample a 36-44 MHz carrier frequency with a l0-bit A/D converter, which is preceded by a programmable gain amplifier (PGA). Two distinct forward error correction (FEC) methods are supported in each receiver. The first standard, ITU-T J.83 Annex A/C, is also referred to as the DVB or DAVIC standard. The second, ITU-T J.83 Annex B, is variously known as DigiCipher II(R) and SCTE DVS-031. The out-of-band (OOB) receiver in the BCM3250 contains a frequency agile oscillator that can down convert any channel in the 70-130 MHz frequency range to a SAW centered IF. The desired channel is then subsampled by a 6-bit A/D converter at a rate that is more than four times the symbol rate. OOB data can be passed through or terminated by the DAVIC MAC or message processor. On the upstream channel, the BCM3250 provides complete Starvue II, Annex B, and DAVIC compatible 4/16-QAM upstream burst FEC encoder and modulator functionality. In the final stage, an on-chip 10bit DAC converts the signal to an analog waveform with programmable output power levels. The DOCSIS/EuroDOCSIS 1.1 MAC includes baseline privacy encryption and decryption, transmission convergence sublayer support, a TDM/TDMA framer and a scatter/gather DMA interface. The MAC in the BCM3250 also includes fragmentation, concatenation, and multiple SIDs, enabling full support for Quality of Service applications such as Voice over IP. The DAVIC 1.2/1.5 MAC enables the BCM3250 to operate in DAVICcentric conditional access systems. It supports Extended Super Frame (ESF) parsing on the downstream and upstream timing/synchronization. Hardware also performs data filtering and SAR functions. The BCM3250 also provides a peripheral control unit consisting of a keypad controller, LED controller, IR receiver and transmitter controller. In addition, dual UARTs, a generic I/O port controller, an interrupt controller, and an RF tuner controller are included. The high level of integration of the BCM3250 provides the lowest system cost for the next generation of interactive set-top boxes. The BCM3250, along with the BCM7038, provides a complete interactive set-top box solution with advanced graphics capabilities. Broadcom(R), the pulse logo, and Connecting everything(R) are trademarks of Broadcom Corporation and/ or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the property of their respective owners. (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2003 by BROADCOM CORPORATION. All rights reserved. 3250-PB10-R 12/29/03 Phone: 949-450-8700 Fax: 949-450-8710 E-mail: info@broadcom.com Web: www.broadcom.com |
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