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详细实现
2.1 硬件规划
FPGA选用的是Xilinx公司的100万门FPGA芯片XC3S1000,其装备芯片为Xilinx公司的4 MB容量PROM芯片XCF04S,以自动串行方法对FPGA进行上电装备。AD、DA分别为ADI公司12位105 MS/s高速模/数变换芯片AD9432与14位105 MS/s高速数/模变换芯片AD9764。SRAM选用Cypress公司的256k×16 bit SRA。
M芯片CY7C1041用于对数据进行大容量缓存,以满意USB的传输需求。USB操控器选用Cypress公司的 EZ-USB FX2系列USB2.0芯片CY7C68013,封装为PQFP128。它支撑USB2.0高速传送,高速率可达480 Mb/s。体系框图如图2所示。
2.2 FPGA程序规划
FPGA程序包含雷达信号模仿模块、雷达信号收集与传输操控模块和SDK中Microblaze的操控与参数传递模块。雷达信号模仿模块完成对雷达中频/视频和杂波信号的模仿,为雷达的接纳体系和信号收集模块供给自检测验信号。雷达信号收集与传输操控模块完成对雷达中频/视频信号的收集与传输操控,该模块为体系实在回波的模仿供给了实测数据。参数的传递由两部分组成:上位机的信号参数输入或信号模仿体系自带的键盘扫描输入与 Microblaze核之间的参数传递;Microblaze将对应的输入参数经过中止调用的方式传递给信号或杂波发生模块。在ISE 9.1环境下经过VHDL硬件言语发生脉冲、LFM等信号,运用EDK 9.1的附件将在ISE 9.1中发生的信号模块转化为对应的IP核 [8]。在EDK开发中,能够将在ISE中发生的信号模仿的IP核直接添加到工程中,IP核和Microblaze处理器之间经过OPB总线实现信号参数和中止信号的传递,使整个开发过程模块化。基于FPGA的嵌入式体系规划的EDK开发中有硬件模块规划和软件操控2个部分,使整个体系兼容了FPGA并行处理的高速率和软件编程的简练。
2.3 驱动程序规划与运用
FX2的设备驱动程序有2种:一种用来在设备接入时从主机下载固件到RAM中,称为固件下载驱动程序(wdgtldr.sys);另一种是在设备从头罗列后加载的通用设备驱动程序(ezusb.sys),应用软件经过该设备驱动程序与FX2通讯[9]。
固件下载驱动程序(wdgtldr.sys)是运用Cypress公司供给的固件下载驱动程序源代码和用户编译成功的固件代码,在Win2000 DDK中创立的。在将固件代码下载到RAM中后,体系铲除内存中的固件下载驱动程序,并进行从头罗列,让8051固件操控FX2。此时,体系获得由 8051固件供给的新的ID号,认为有新的USB设备接入,并据此加载相应的通用设备驱动程序。通用设备驱动程序一般不需求从头编写,能够直接运用 Cypress公司已经编好的驱动程序ezusb.sys。
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