基于双端口RAM的便携式心电监护仪设计

目的：设计基于双端口RAM的双单片机便携式心电监护仪，解决心电监护数据传送的瓶颈问题。方法：双端口RAM芯片具有2套完全独立的数据线、地址线和读写控制线．因而可使2个CPU分时独立访问其内部RAM资源。主单片机在片上RAM缓存采集数据，满200B，打包写入双端口RAM．双端口RAM缓冲区中的数据达到闪存的页容量时，通知从单片机读取数据，从单片机以页编程方式一次写入闪存。结果：解决了双端口RAM的端口争用问题，并讨论了极限采样频率，实现了主、从单片机数据共享，缓存采集信号，即使在较高采样频率下．仍能确保及时、可靠地存储实时信号。结论：便携式心电监护仪中通常使用大容量NAND闪存实时存储采集到的信号．但是由于NAND闪存的数据写入是以页编程为基础．因而限制了前端采样频率的提高。基于双端口RAM的双单片机便携式心电监护仪的设计合理地的解决了心电监护数据传输的瓶颈问题．

Portable ECG Holter''''s Design Based on Dual-port RAM

Objective To transmit ECG signals through a portable dual-mcu ECG holter based dual-port RAM.Methods Dual-port RAM had two independent address,data and control buses,which allowed the two processors accessed it's resource independently at different time.The master processor buffered the acquired data on its RAM until the data accumulated to 200 Bytes.Then the 200 Bytes would be transferred into the dual-port RAM at one time.The slave processor was informed to fetch the data when it reached the flash's one whole page.Results Problems in such aspects were conquered as the port contention of dual-port RAM,limiting sampling frequency,data sharing between the master and slave processors as well as acquiring signals by the cache.Conclusion The portable dual-mcu ECG holter based dual-port RAM can be applied to transmission of ECG signals.