七段阴极数码管的FPGA控制程序，开发平台为ISE或者quartus,Seven-Segment LED cathode the FPGA control procedures, development platform for the ISE or Quartus

七段数码管的驱动程序，输入四位二进制码，输出七位数码管(低电平驱动)驱动代码-Segment digital tube driver, enter the four-bit binary code, the output of seven digital tube driver code