基于DSP开发系统设计与实现

为了设计一个性能稳定的DSP开发系统，利用TI公司最新推出的TMS320F28335作为微处理器，该芯片为32位浮点型DSP。在采用浮点DSP设计系统时，不需要考虑处理的动态范围和精度，比定点DSP在软件编写方面更容易，更适合采用高级语言编程。外围电路主要包含电源电路、RAM扩展电路、晶振电路和复位电路，用来辅助DSP的工作。利用电源管理芯片设计电源电路，可以有效解决其他型号的DSP对上电顺序的要求；扩展的外部RAM可以使程序的调试与下载更加方便。利用外部时钟源作为时钟输入，使其输入时钟更加稳定的同时，也可为具有相同时钟的多个DSP使用。利用三端监控芯片来实现系统的手动复位和自动复位，使系统的稳定性大大提高。

Design and implementation of DSP development system

DSP is widely used in some fields,such as auto-control,electric measurement,spaceflight projects and so on.TMS320F28335 newly detruded by TI is taken as a micro-processor in the design of a DSP development system with stable performance.This is a 32-bits floating point DSP.When the floating point DSP is adopted to design the system,the dynamic range and precision of the system need not be considered.It is easier in software compiling,and more suitable for programing with advanced language than fixed-point DSP.The peripheral circuits consists of power circuit,extend RAM circuit,oscillator circuit and reset circuit,which are applied to the auxiliary to DSP.The power management chip is used to design power circuit,the way which can meet the requirement of other DSPs for the power-on sequence.The extended RAM makes debugging and download of procedure more convenient.A external clock is applied to clock input,which not only makes input clock more stable,but also use for other kinds of DSP.Stability of system is improved because the monitoring chip accomplishes hand and automatic resets.