基于DDR2的二维波形映射技术研究与实现  

Research and implementation on 2D wave mapping technology based on DDR2

作　　者：许根泉[1] 叶芃[1] 邱渡裕[1] 

机构地区：[1]电子科技大学自动化工程学院,成都611731

出　　处：《电子测量技术》2011年第9期54-57,共4页Electronic Measurement Technology

摘　　要：波形捕获率是衡量示波器波形采集性能的1个重要指标,提高示波器的波形捕获率有助于提高对偶发信号的捕获能力。利用FPGA内部RAM资源或者外挂高速RAM作为映射缓冲区这一做法已经被广泛采用,但是成本高、局限性大。基于DDR2 SDRAM读写速度快、容量大、器件成熟的优点,设计了1种采集与显示并行处理的二维波形图像处理单元(WGPU)。映射结果表明利用本设计可以大大提高示波器的波形捕获率,改善示波器对偶发信号的捕获能力。Waveform capture rate is an important standard which stands for the measure ability of an oscilloscope.Increasing the waveform capture rate can improve the ability of capturing occasional signal of an oscilloscope.Although the method of using internal RAM of FPGA or external high-speed RAM has been widely used,the high cost and limitations cause a problem.Based on the advantage of DDR2 SDRAM,we designed a 2D waveform graphic processing unit（WGPU）which operate the waveform acquire and display parallel.The mapping result showed that the design can greatly increase the waveform capture rate and improve the ability of capturing occasional signal.

关 键 词：死区时间 波形捕获率 DDR2SDRAM 状态机 

分 类 号：TB971[一般工业技术—计量学]