The paper describes the architecture of the clock timing system.
文中详细介绍了此时钟授时系统的系统结构。
A binary tree routing topology is designed for propagating the system clock and trigger signal and the accurate timing and synchronization between sensors are provided by CPLD.
设计了二进制树型拓扑结构传播统一的系统时钟和触发信号，采用CPLD提供传感器间的精确时序和同步。
Absrtact: Along with the increase of digital system working frequency, clock period gets shorter, timing of the system becomes more complex.
摘要：随着数字系统的工作频率的不断提高，时钟周期逐渐变小，而系统时序却越来越复杂。
Our circadian clock, or biological timing system, governs our daily cycles of feeding, activity and sleep, with respect to external dark and light cycles.
我们的生物钟或生物调时系统，对外界黑夜和天明循环的反应，控制着我们每天进食、活动和睡眠的循环。
As the computer clock is not accurate enough, the timer card also records time beats from Global Positioning System (GPS). This makes accurate timing of cosmic ray arrival feasible.
同时，由于电脑的内置时钟不够精确，计时器亦会记录来自全球定位系统的报时讯号，以便准确计算宇宙射线的接收时间。
As the computer clock is not accurate enough, the timer card also records time beats from Global Positioning System (GPS). This makes accurate timing of cosmic ray arrival feasible.
同时，由于电脑的内置时钟不够精确，计时器亦会记录来自全球定位系统的报时讯号，以便准确计算宇宙射线的接收时间。
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