基于FPGA的UART自适应波特率发生器的实现

Realization of Self-adapting Baud Rate Generator for UART based on FPGA

针对现有波特率检测法存在速度慢、设计繁琐等问题,提出基于FPGA采用特征值匹配法实现自适应波特率发生器的设计原理。该设计通过电平检测模块对串行通信线路上的一个脉冲周期进行采样计数,采用特征值匹配的方法得到串行线路数据波特率,然后再对数据进行中心采样,完成数据的传输。软件仿真和硬件模拟表明:该设计实现方法简单、精度高、速度快、占用资源少。

The present baud rate detection has disadvantages such as slow speed, cumbersome designing, etc. A self- adapting baud rate generator for UART based on FPGA and matching feature values is put forward in the pa- per. A level detector is used for counting the numbers on a pulse period of serial line and matching feature values, and then the baud rate is obtained. The baud rate generator sampled center of data bits and UART completes data transmission. Software simulation and hardware implementation study show that the design and realizing method is simple with high accuracy, fast speed and less resource occuoied.