Time clock signal source directly fetches from clock signal of PCI bus in the computer system or signal generator, which can generates high frequency time clock signal.

• 该时钟信号源直接取自于该电脑系统中PCI总线的时钟信号或是一可产生高频时钟信号的时钟信号产生器，用以供应该计数电路所需的输入时钟信号。