基于SPI方式DSP外部E^2PROM接口设计

DSP External E^2PROM Interface Design Based on SPI

针对在研发过程中经常用到的TMS320VC5402芯片在扩展外部数据存储器时所存在的难题,提出一种基于SPI方式的外部数据存储器扩展方式,介绍TMS320VC5402的多通道缓冲串口工作在SPI高效串行数据接口方式下的基本操作及存储器的SPI模式读写操作,并给出读写操作时序图。该方式的提出,不但节省了TMS320VC5402芯片的I/O口,而且提高了存储速度,简化了硬件电路,提高了系统的可靠性和开发难度,并在实际应用中验证了该方法是可行的。

According to problems of commonly used TMS320VC5402 in expanding external data storage,a SPI -based external data memory expansion is proposed. The basic operation of TMS320VC5402 multi - channel buffered serial port （McBCP） in the SPI serial data interface, read and write operation in SPI mode,and read and write operation timing diagram are introduced. The proposed approach not only saves TMS320VC5402 I/O,improves storage speed and simplifies the hardware circuitry, improves reliability of the system and difficulty of study, and verifies the method is feasible in practical application.