博通 BCM7325单片 STB解决方案

博通（Broadcom）公司的BCM7325是高清卫星电视片上系统，它集成了基于BCM4506前端技术的调谐器/解调器以及支持多种视频格式的最新的AVC译码器，支持基于DVB-S2和 8PSK的DBS传输标准，并相后和DVB-S标准兼容。BCM7325运行于333-MHz，工作在双线程MIPS CPU核，具有超过600 DMIPS的性能。可用于低成本高清卫星电视机顶盒（ STB）。本文介绍了BCM7325的主要性能，主要优势，单片系统方框图以及BCM7325参考设计方框图。

BCM7325 High-Definition Satellite System-on-Chip with Integrated DVB-S2

The BCM7325 is Broadcom’s next-generation satellite set-top box system on a single chip in 65-nm process. It integrates a single tuner/ demodulator from the BCM4506 front-end technology and the latest generation of AVC decoder that supports multiple video formats. The BCM7325 supports worldwide standards for DBS transmission systems based on DVB-S2, 8PSK, and is backward compatible with the DVB-S standards. The BCM7325 operates on a dual-threaded MIPS CPU core running at 333-MHz and yielding over 600 DMIPS in performance. The BCM7325 is designed to support UMA and non-UMA memory architectures, utilizing a 400-MHz clock, 32-bit wide Double Data Rate (DDR2) memory I/F for enhanced performance and allows cost-effective memory solutions. The BCM7325 is a true single chip that can decode transport streams delivered via the integrated DBS front end. In addition, it is capable of decoding external TS input from 10/100 Ethernet ports. Several interfaces required for TV output are integrated on chip including the HDMI, baseband composite, component, or S-Video. An RF channel 3/ 4 modulated output is also integrated on-chip. An HD video encoder with copy protection that supports NTSC, PAL, and SECAM with simultaneous SD output and optional Macrovision/DCS support is integrated on chip. The BCM7325 incorporates Broadcom’s advanced 2D graphics engine, offering true studio-quality text and graphics with efficient use of memory and bandwidth. A full range of peripheral devices is supported on the BCM7325, including UARTs, dual ISO7816 smart card interfaces, GPIO, counters/ timers, IR Tx/Rx, UHF Rx, I2C, and SPI controllers.

主要特性：
Integrated wide-band silicon tuner with DiSEqC 2.x and programmable FSK transceiver
Integrated demods
DVB-S2 8PSK Demod
QPSK demod (market-dependant)
AVC-compliant video decoder for MPEG-4 Parts 2 and 10, MPEG-2, VC-1, ATSC, DivX, Xvid
Programmable decoder supports multiple formats including MPEG Layers 1 and 2, AC3, AAC, PCM Audio
Multi-threaded MIPS CPU
350 MHz, 32-KB I/D, 128-KB L2
MMU and FPU support, EJTAG debug interface
400-MHz  Clock (800-MHz Data) rate DDR2 memory configurable in UMA and non-UMA modes
NAND/NOR flash support
Rich 2D graphics based on Broadcom® Graphics Engine
10/100 Ethernet with PHY and MII
Dual USB 2.0 ports
On-chip Security Processor
Low cost DVB-CI support

主要优势：
Provides a cost-effective single-chip solution for high-definition Direct Broadcast Satellite (DBS) applications.
Based on field-proven and production-ready subsystems offering energy-efficient performance.
Feature-rich, fully integrated SoC reduces the external components needed and reduces PCB real-estate.
Allows cost-effective DDR2-based memory with support for UMA and non-UMA modes. •Advanced 2D-graphics system allows a variety of applications to deliver studio-quality text and graphics on television screens.

Broadcom-developed device drivers enable rapid software development cycles with support of industry-standard operation systems.
Industry-leading third party operating systems, toolchains and middleware supported.
65 nm process technology offers low power and lower cost.



图1。BCM7325单片系统方框图



图2。BCM7325参考设计方框图