基于PCIe over optical fiber的CBM-TOF超级模块质量评估读出方法
Readout method based on PCIe over optical fiber for CBM-TOF super module quality evaluation
摘要：
压缩重子物质（CBM）实验将研究高净重子密度和中等温度下的量子色动力学（QCD）相图。CBM飞行时间（TOF）系统由超级模块组成，其中包含高性能的多间隙电阻板室（MRPC）。在批量生产过程中，需要对每一个装配有MRPC的超级模块进行质量评估，包括时间测量和数据读出。读出电子设备面临着以大约6 Gbps的速度从超级模块读取数据的挑战。针对CBM-TOF超级组件的质量评估问题，提出了一种基于光纤PCIe的读出方法。来自超级模块的数字化数据将集中在前端电子设备处，然后使用PCIe协议通过光纤传输到PCIe交换模块（PSM）。PSM通过后端数据采集服务器的金手指直接插入主板。利用这种读出方法，可以达到高速传输速率。此外，PSM可以同时接收来自多个超级模块的数据，这对于提高评估效率非常重要。这种读出方法简化了读出电子器件的结构，并支持前端和后端之间的长距离传输。
英文摘要：
The Compressed Baryonic Matter (CBM) experiment will investigate the quantum chromodynamics (QCD) phase diagram at high net baryon densities and moderate temperatures. CBM Time of Flight (TOF) system is composed of super modules containing high performance Multi-gap Resistive Plate Chambers (MRPCs). During the mass production, each super module assembled with MRPCs needs quality evaluation, which includes time measurement and data readout. Read out electronics encounter the challenge of reading data from a super module at a speed of about 6 Gbps. In this paper, a read out method based on Peripheral Component Interconnect Express (PCIe) over optical fiber is proposed for CBM-TOF super module quality evaluation. The digitized data from super module will be concentrated at the front-end electronics, and then be transmitted to a PCIe switch module (PSM) over optical fiber using PCIe protocol. The PSM is directly plugged into the motherboard via gold fingers at the backend data acquisition server. With this readout method, a high-speed transmission rate can be reached. Furthermore, a PSM can receives data from several super modules simultaneously, which is important to improve the evaluation efficiency. This readout method simplifies the architecture of readout electronics and supports long distance transmission between frontend and backend.
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