Verilog HDL的PLI子程序接口，用于与用户C程序在2个方向上传输数据，可用xilinx ISE，quartusii或modelsim仿真，-Verilog HDL PLI subroutine interfaces, for C program with the user in the direction of two transmission of data, available xilinx ISE. quartusii or modelsim simulation,