在DM642的开发板中，视频图像解码芯片使用飞利浦公司的saa7115，其功能就是产生行，场，帧同步信号，并且使用梳行滤波器将图像数据分割开来，并传输亮度信号，此程序即控制saa7115的运行！-In the DM642 development board, the video image decoder chip using the Philips saa7115, its function is to have a line, field, frame synchronization signal, and the use of comb line filter will be separated from image data, and brightness of the signal transmission, this procedures that control the operation of saa7115!