数字示波器中的波形存储、录制与回放

波形存储、录制与回放是数字示波器的重要功能。在此采用闪速存储器（FLASHMemory）存储重要的波形数据，方便用户事后调出观察、分析和对比。每段波形存储的长度固定，根据存储波形的序号、大小、起始地址等建立波形存储索引表，通过查询波形索引表可选择要回放的波形。还可以通过波形录制功能把信号波形录制到静态数据存储器（SDRAM）中，然后回放波形，寻找并观察自己需要的波形。通过直接存储（DMA）方式实现将显示缓冲区存储的波形搬移到波形录制的缓存中去，实现了数据的高速存储。在手持式示波表的研制过程中实现了此波录制和回放方法达到了预期的效果。

Waveform Storage, Recording and Playback in Digital Oscilloscope

Waveform storage,recording and playback are the important functions of a digital oscilloscope(DSO).The FLASH memory is adopted to store the important waveform data.It is convenient for users to call out the waveform information to observe,analyze and compare.Since the length of each stored waveform is fixed,and the index table of the stored waveforms is established according to their serial numbers,sizes and starting addresses,the waveform that is needed to playback can be found by querying the index table....