龙芯3A4000主板VGA接口电路设计及研究  

Design and research on VGA interface circuit of Loongson 3A4000 motherboard

作　　者：籍明慧 裴焕斗 宫健 张川川 庄杰 Ji Minghui;Pei Huandou;Gong Jian;Zhang Chuanchuan;Zhuang Jie(School of Instrument and Electronics,North University of China,Taiyuan 030051,China;Shanxi 100 Trust Information Technology Co.,Ltd.,Taiyuan 030006,China)

机构地区：[1]中北大学仪器与电子学院,山西太原030051 [2]山西百信信息技术有限公司,山西太原030006

出　　处：《电子技术应用》2021年第11期105-109,115,共6页Application of Electronic Technique

基　　金：山西省科学技术厅安全可信计算机主板研发和产业化项目(201903D111003)。

摘　　要：VGA接口以其良好的兼容性、成熟的技术优势、较低的成本等优点成为电子设备显示应用中最为广泛的接口类型。基于龙芯3A4000主板功能性要求,利用高性能视频数模转换芯片ADV7125将DVO总线数字信号转换为模拟信号通过VGA接口实现视频输出。对VGA接口及实现原理做了基本介绍,并对VGA视频输出功能拓扑结构以及VGA接口电路设计做了详细的描述。测试结果表明,对于不同显示模式的视频信号,该接口电路设计均符合功能性及可靠性要求,视频显示功能正常且性能良好。Video Graphics Array(VGA)interface has become the most widely interface type in the display application of electronic devices with its good compatibility,mature technical advantages and low cost.Based on the functional requirements of Loongson 3A4000 motherboard,DVO bus signal is converted to analog signal by using the ADV7125,a high-performance video digital-to-analog converter(DAC),and video signal is exported through VGA interface.The VGA interface and implementation principle are introduced,the VGA video output function topology and the circuit design of VGA interface are described in detail.The results show that the interface circuit design meets the requirements of functionality and reliability for video signals of different display modes,and the video display is normal with good performance.

关 键 词：龙芯3A4000 VGA接口 ADV7125 电路设计 

分 类 号：TN919[电子电信—通信与信息系统]