第一次进入登录与回报用户，应用程序的存储器存储？
Entering login first time vs return user, storing in app memory?
在硬件设计主要介绍系统组成中的外部存储器模块与视频输入输出模块，介绍了使用片上支持库编写DM642中视频驱动程序的方法，以及编写过程中DM642中断和直接存储器存取（DMA）的应用；
The hardware chapter introduces the external memory module and video I/O module, programs video-driver for the DM642 by using CSL, discuss the applications of interrupt and direct memory access (DMA).
在应用程序中开辟了两个缓冲区，交替与传输卡上先进先出存储器（FIFO）通信，实现了主机到外设之间高速无间断数据传输；
In the design of application software, two buffers A and B were used to communicate with the FIFO on the card alternately. Thus the high speed continuous data transmission was achieved.
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