摘 要：本文介绍了USB接口多路通信芯片FT4232H的主要特点与性能。分析了基于Cortex-A9微处理器i.MX6和FT4232H的多串口扩展的实现原理，实现了i.MX6与FT4232H的软硬件接口设计。成功应用到某车载系统中，结果显示扩展的串口具有稳定、可靠、误码率低等特点。
关键词：嵌入式系统 Cortex-A9 串口扩展 FT4232H
Abstract: The main characteristics and performance of USB interface multiple serial port expansion chip FT4232H are introduced in this paper. The realization principle of multi serial port expansion based on Cortex-A9 microprocessor i.MX6+FT4232H is analyzed.
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