第三章详细阐述了GPIB控制器的十种接口功能及其状态机实现，完全遵循ieee - 488协议规范。第四章对数据通路进行了较为细致的说明。
Chapter three introduces the GPIB controller interface function, especially the designing of state machine according to IEEE-488. Chapter four introduces the designing of data channel.
这些功能为整个系统建立起一条基本的数据通路。
These functions build a basic data path for the whole system.
本文设计并实现了基于视频格式转换芯片的OSD系统，实现包括I2C串行通信，数据通路和OSD图像与视频叠加的功能。
In the paper, a design of OSD system based on video format convert chip is introduced, including the realization of I2C communication, data-pass and overlap of image and video.
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