基于相变存储器的音频存储播放系统设计

Design of Audio Recording and Playing System Based on Phase Change Memory

基于研制成功的国内第一款8M-bits相变存储器(8Mb PCM)试验芯片,设计了一套音频存储播放系统。该系统主要由8Mb PCM芯片,现场可编程门阵列(FPGA),音频输入输出电路以及音频转换电路模块(AD73311芯片)等部分构成。系统以FPGA为核心处理单元,录音时将音频输入信号进行模/数(A/D)转换并存储到8Mb PCM中,播放时将8Mb PCM中存储的信息读出并通过数/模(D/A)转换成音频信号输出。板上验证结果表明:该系统的音频存储播放效果良好,可对8Mb PCM进行多次正确的读写操作。由此证实了8Mb PCM性能的完整性以及可靠性,为相变存储器后续的商业化应用打下坚实的基础。

An audio recording and playing system is designed basing on the first 8M -bits Phase Change Test Memory manufactured successfully in China. The system is mainly composed of 8Mb PCM, Field Programmable Gate Array （FPGA）, audio input/output circuit and audio A/D_D/A conversion circuit （AD73311 chip） etc. Using FPGA as the main process unit, the system converts the audio input analog signals into digital signals and then stores the signals into the PCM when recording. And in the playing process, the system reads out the information stored in the PCM and then converts the audio digital sig- nals to analog signals for playing. The results of onboard verification indicate that the effect of the system on storing and playing is good. Meanwhile, the system can conduct reading and writing operation on 8MbPCM correctly and repeatedly. It is confirmed that the performance of 8Mb PCM is integral and reliable, which lays a solid foundation for the subsequent commercialization application of Phase Change Memory.