基于FPGA的A2B总线误码率测试系统设计
电子技术应用
吴文杰,马晨曦,许超
中国电子科技集团公司第五十八研究所
摘要: ADI公司研发的A2B(车载音频总线)已成为车载数字音频主流方案,其误码率对车载音频信号音质影响显著。提出了基于FPGA(现场可编程门阵列)的A2B总线误码率测试方案,采用三颗AD2428W构建一主两从的A2B总线架构;由FPGA完成A2B总线配置,发送测试数据至总线同时接收总线输出的数据以检验误码数;再通过串口将误码数上传至上位机。经测试系统硬件及软件设计,持续288 h测试显示误码数为0,误码率低于1×10-14,试验验证该系统可有效检测误码,且程序易更改移植。
中图分类号:TN912 文献标志码:A DOI: 10.16157/j.issn.0258-7998.257568
中文引用格式: 吴文杰,马晨曦,许超. 基于FPGA的A2B总线误码率测试系统设计[J]. 电子技术应用,2026,52(9):119-122.
英文引用格式: Wu Wenjie,Ma Chenxi,Xu Chao. Design of bit error rate test system for A2B bus based on FPGA[J]. Application of Electronic Technique,2026,52(9):119-122.
中文引用格式: 吴文杰,马晨曦,许超. 基于FPGA的A2B总线误码率测试系统设计[J]. 电子技术应用,2026,52(9):119-122.
英文引用格式: Wu Wenjie,Ma Chenxi,Xu Chao. Design of bit error rate test system for A2B bus based on FPGA[J]. Application of Electronic Technique,2026,52(9):119-122.
Design of bit error rate test system for A2B bus based on FPGA
Wu Wenjie,Ma Chenxi,Xu Chao
The 58th Research Institute of China Electronics Technology Group Corporation
Abstract: The A2B(Automotive Audio Bus) developed by ADI has become a mainstream solution for automotive digital audio, and its bit error rate has a significant impact on the sound quality of automotive audio signals. This paper proposes a bit error rate test scheme for the A2B bus based on FPGA(Filed Programed Gate Array). Three AD2428W chips are used to build an A2B bus architecture with one master and two slaves. The FPGA completes the configures of the A2B bus, sends test data to the A2B bus, and simultaneously receives the data output by the bus to check the number of bit errors, and then uploads the number of bit errors to the upper computer through the serial port. Through the design of the hardware and software of the test system, the continuous 288 hours test shows that the number of bit errors is zero and the bit error rate is lower than 1×10-14. The test verifies that the system can effectively detect bit errors, and the program is easy to modify and transplant.
Key words : A2B bus;AD2428W;FPGA;bit error rate
引言
随着汽车智能座舱的发展,车载音频技术也快速进步。ADI公司研发的A2B(Automotive Audio Bus,车载音频总线)只需要一对非屏蔽双绞线串联各音频设备,减轻线束质量,已逐渐成为车载数字音频的主流方案[1]。汽车网联化推动下,多媒体、语音交互、主动降噪等音频处理技术逐步成为标配,需传输处理的音频信号回路增多,对信号质量要求也变高[2]。A2B总线是车载音频系统的重要组成部分,其实现数字音频信号的传输。在数字音频系统中,即便是极少数的误码,也可能导致无法辨认原始数字信号,造成严重的音质问题。因此A2B总线的误码率测试尤为重要。
目前耿晓峰等人提出了回环测试法[3],采用SoC(系统级芯片)解析处理音频信号,专业性强且不易实现。本文提出了一种基于FPGA(现场可编程门阵列)的A2B总线误码率测试方案,使用Intel公司的Cyclone IV系列FPGA(EP4CE10F17C8)及相关外围电路,与A2B总线音频接口连接,实现误码率测试功能,并通过UART串行接口将累积误码数传输至上位机显示监测。相比SoC处理方案更通用,且FPGA程序易重构,方便移植优化。
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作者信息:
吴文杰,马晨曦,许超
(中国电子科技集团公司第五十八研究所,江苏 无锡214026)

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