关键词: 时钟信号, 时序电路, FPGA, 震荡器

Abstract: Clock signal is the basis of timing circuit and the safeguard of circuit operation. The miniaturization and cost-effectiveness of the printed circuit board (PCB) entails strict requirements on physical size and layers, thereby crippling the method of obtaining various-frequency clock signal using oscillator and clock distribution ICs. The paper presents three FPGA-based clock signal implementation methods capable of replacing the traditional method when FPGA pins are adequate.

Key words: clock signal, sequential circuit, FPGA, oscillator