An interface chip used as the RS485 bus controller based on HDLC protocol was introduced, which was written in VHDL at the RTL level and implemented by a single FPGA chip.

• 介绍了以HDLC协议控制为基础的RS-485总线通信控制器；采用VHDL语言在RTL级设计；并在单片FPGA上实现.