瑞士光源的计时系统
Timing system of the Swiss Light Source
摘要：
Swiss Light Source的计时系统基于APS，Argonne [1]的事件系统概念。然而，对于SLS，硬件完全重新设计，同时保留与APS系统的软件兼容性。这让我们在实施过程中领先一步：我们可以使用最新的硬件，并利用EPICS软件中集成的功能。事件系统被用作唯一的定时分配方法，用于硬件触发传递（在几个地方有高精度延迟辅助）和控制所有与定时相关的操作任务：注入器排序、填充模式、软件同步、时间戳等。事件网络还扩展到光束线，以实现光束线实验的同步。该实现包括硬件（千兆以太网链路，FPGA）和一个用VHDL编写的固件核心。卡的功能可以通过在闪存中重写固件来原位修改。另一方面，该功能可以很容易地移植到新的硬件架构，允许平滑的升级路径和最大限度地重用软件和硬件资源。[1]F.R.Lenkszus等人，“先进的光子源事件系统”，Proc.ICALEPCS '95
英文摘要：
The timing system of the Swiss Light Source is based on the event system concept of APS, Argonne [1]. However, for SLS the hardware was completely redesigned while preserving the software compatibility with the APS system. This gave us a head start in the implementation: we could use the latest available hardware and take advantage of the features integrated in the EPICS software. The event system is used as the sole timing distribution method, for hardware trigger delivery (assisted with a high-precision delay at a few places) and for controlling all the timing-related tasks of operation: injector sequencing, filling patterns, software synchronization, timestamps and so on. The event network is also extended to the beamlines to allow synchronization of the beamline experiments. The implementation consists of the hardware (Gigabit Ethernet link, FPGAs) and a firmware core written in VHDL. The functionality of the cards can be modified in situ by rewriting the firmware in flash memory. On the other hand, the functionality can be easily ported to new hardware architectures, allowing smooth upgrade paths and maximal reusability of the soft- and hardware resources. [1] F.R.Lenkszus et.al., 'The Advanced Photon Source Event System', Proc. ICALEPCS'95
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