for the large amount of image data that requires to be processed at one time, the thesis expands the external memory, breaking the restriction of only 64k addressing range; according to system specialty of strong function and large program and the request of upgrade convenience, flash memory is used as storage medium, when dsp is powered up and reset, the user code is loaded from flash memory into external sram to run 由于需要处理的图像数据量较大,对外部存储器进行了扩展,突破了外部数据空间64k的限制;根据系统功能强,程序大的特点以及软件升级便利的要求,以flash存储器作为用户代码的存储介质,在dsp上电复位时再将用户程序加载到sram中运行。