I^2C总线接口的设计及验证

Design and Verification of I^2C Bus Interface

在视频采集时,摄像机输出的模拟信号需要转换为数字信号,SAA7113芯片可以实现这种模/数转换功能。介绍在开发FPGA图像采集功能时,I2C总线模块的设计思路,并利用Verilog HDL语言实现I2C总线接口的功能;同时利用I2C总线对SAA7113芯片进行配置,为实现视频图像的模/数转换和图像采集搭建环境,在设计SAA7113模块状态机时有意缩小SAA7113寄存器的配置范围,从而节省配置时间。

When collecting the video image, the analog signals output from the camera need to be converted into digital signal,and SAA7113 chip can realize such analog/digital conversion. The design idea of I^2C bus module is introduced when exploiting the image collection function of FPGA. The function of I^2C Bus interface is realized by using Verilog HDL language, also the SAA7113 chip is configured through I^2C Bus, which builds an environment for the collection and analog/digital conversion of video image. When designing the state machine of SAA7113 module, the disposition range of SAA7113 register is purposively reduced, thus the time of disposition is decreased.