这个芯的设计是与国家半导体PC16550D兼容 UART（通用异步接收器/发送器）。一些差异：该FIFO的始终启用 不支持置顶奇偶-This core is designed to be a compatible with the National Semiconductor PC16550D UART (Universal Asynchronous Receiver/Transmitter).Some differences: The FIFO’s are always enabl