高度集成的MB87M3550能在2GHz到11GHz的频段实现MAC,PHY,无线控制以及所有所需的模拟电路. MB87M3550能工作在TDD或FDD模式，支持所有可用的信道带宽，从1.75MHz到20MHz．可编程的频率选择能产生可用于任何带宽的取样时钟．SoC芯片MB87M3550集成了ARM926 RISC，能实现802.16 上层MAC，调度程序，驱动器，协议堆栈，以及应用软件．多通路的DMA控制器能在高性能总线上处理各个接入点的高速数据交换．本文介绍了MB87M3550的主要特性，以及多种参考设计的方框图．

This highly integrated SoC implements MAC, PHY, radio control and all the necessary analog circuits for the appropriate 2 to 11GHz licensed or license-exempt bands.
The Fujitsu WiMAX SoC, MB87M3550, fully complies with the IEEE 802.16-2004 standard using an OFDM PHY. The SoC can operate in TDD or FDD modes and supports all the available channel bandwidths from 1.75MHz up to 20MHz bandwidths. A programmable frequency selection generates the sample clock for any desired bandwidth. When applying 64QAM modulation in a 20MHz channel and using all 192 sub-carriers, the SoCs data rate can go up to 75Mbps. Uplink subchannelization is supported as defined in the standard.
The SoCs integrated ARM926 RISC engine implements 802.16 upper layer MAC, scheduler, drivers, protocol stacks, and user application software. A multi-channel DMA controller handles high-speed transactions among various agents on a high-performance bus.
To offload processing from the upper layer MAC and enhance performance, the Fujitsu WiMAX SoC includes a separate ARC RISC/DSP engine to execute 802.16 lower layer MAC functions. The chips multiple hardware-based encryption/decryption engines are tightly coupled with this lower layer MAC processor and can be enabled to provide
full security for the MAC privacy sub-layer.
      主要特性：
Full compliance with the IEEE 802.16-2004 standard
Support for both subscriber stations and base stations for TDD or FDD applications
High-performance modulation capabilities for complete versatility:
256 OFDM PHY with 64QAM, 16QAM, QPSK, and BPSK modulation
Uplink subchannelization for 16 subchannels
Flexible configuration for easy system integration:
High-performance ADC and DAC for flexible baseband interfacing
Automatic frequency control (AFC) with integrated DAC
Dynamic frequency selection (DFS) with integrated ADC
Integrated ADC for transmit and receive power measurements
Rich set of integrated peripherals and RF control
Programmable automatic gain control (AGC) for supporting a broad range of RF attenuators
Security implementation based on DES, AES/CCM encryption/decryption
Dual RISC processors for implementing upper and lower layer MAC
Integrated memory controller and DMA controller
Integrated Ethernet engine for network interface
436 BGA package
Complete reference design with software and radio solution

                                                图1 - MB87M3550简化方框图
       系统应用：
The Fujitsu WiMAX SoC suits several types of applications:
BWA systems compliant with WiMAX specifications
Low-cost subscriber stations
Enterprise CPEs
Base stations
2 to 11GHz licensed and license-exempt bands
Suitable independent frequency bands at 2.5, 3.5, 3.6 or 5.8GHz
Half FDD / full FDD or TDD applications
Programmable automatic gain control (AGC) for supporting a broad range of RF attenuators
Security implementation based on DES, AES/CCM encryption/decryption
Two Fujitsu WiMAX SoCs work together to implement fullduplex FDD applications. The SoC can also work with an external processor to enhance performance in demanding base-station applications.
        参考设计硬件平台：
Several hardware platforms are available with the performing chip, software, and system verification. The reference board evaluation system for subscriber stations (Figure 2) can be configured to support either TDD or HDX FDD, depending on the radio selection. The simplified base station evaluation system (Figure 3) provides an example of a full duplex FDD implementation using an external processor. The key features of the evaluation boards include:
RF port interface for third-party radio
Radio module
Network interface
On-board memory
On-board control using SPI, I2C, and GPIO
Debug port interfaces
RS232C interface port
External power supply interface

       WiMAX 参考设计套件包括：
Reference Board utilizing the highly integrated MB87M3550 WiMAX SoC
Software package to run the SoC and Reference Board
Software package to install the SoC Reference Kit as a half-duplex WiMAX Subscriber Station
Optional modules are available to support base station functionality with an external processor

              图２．采用MB87M3550的TDD 或HDX FDD参考设计评估系统方框图．

             图３．采用外接处理器的TDD 或HDX FDD参考设计评估系统方框图．

             图４．采用外接处理器的全双工FDD BS参考设计评估系统方框图．
参考设计软件平台：
Major features of the Fujitsu 802.16 software platform include the following:
Compliance with the IEEE 802.16-2004 standard specification
MAC security sub-layer for subscriber station authentication and data encryption
Multiple service class support to differentiate service quality
Dynamic service management to activate service class when needed
MAC portability to different RTOSes