Design and implementation of intelligent serial communication card based on FPGA

Serial communication module is a part of external communication module which is necessary for every computer.However,because of too many serial communication protocols and interfaces,more resources and volumes are always occupied by the serial communication module. In this paper,three serial communication protocols(RS-232,RS 422 and RS 485)are compatible with two serial communication modes(UART and HDLC) into an intelligent communication board through FPGA. The configuration of eight serial communication channels is completed under the control of the control interface of upper computer.The overall structure and the hardware design of the communication board are introduced in this article. At last,the communication result of the upper computer control interface is displayed. The conclusion proves that this intelligent serial communication board can execute the switching between multi- protocol and multi- mode,and meet the requirements of different kinds of serial communication as expected.