自己用VerilogHDL语言编写的时钟程序，包括时钟进位计数模块，数码管显示模块和闹钟模块。在cpld芯片上经测试有效（开发环境没找到VerilogHDL，就选了VHDL，其实他们不一样的……）-Clock with Verilog HDL language written procedures, including clock binary counter module, digital display and alarm modules. The CPLD chip has been tested (in development environment I did not find VerilogHDL, we chose VHDL, in fact, they are not the same ...)