本文使用实例描述了在 FPGA/CPLD 上使用 VHDL 进行分频器设计，包括偶数分频、非 50 占空比和50 占空比的奇数分频、半整数（N+0.5）分频、小数分频、分数分频以及积分分频。所有实现均可通过 Synplify Pro 或 FPGA 生产厂商的综合器进行综合，形成可使用的电路，并在 ModelSim 上进行验证。-This paper describes the use of examples prescaler to use VHDL design on FPGA/CPLD, including even frequency, non-50　duty cycle and 50　duty cycle odd frequency, half-integer (N+0.5) Divide, fractional, fractional and integral crossover frequency. All can be achieved through Synplify Pro FPGA synthesizer manufacturer or integrated to form a circuit that can be used and verified in ModelSim.