【摘要】：隨著網絡技術的蓬勃發(fā)展,以太網以其協(xié)議通用性、遠距離傳輸、靈活的網絡拓撲以及不斷發(fā)展的網絡帶寬等諸多優(yōu)勢,被廣泛應用到測試領域。網絡化自動測試系統(tǒng)主要針對分布式測試任務,與以太網普通應用相比,需實現控制操作的精確性和采集數據的時序關聯(lián)性。IEEE 1588協(xié)議標準是網絡化自動測試系統(tǒng)中實現測試設備及測試數據精密同步的重要方式。隨著被測目標的測試復雜度和測試內容的持續(xù)增長,百兆以太網已很難適應系統(tǒng)對數據傳輸的需求,千兆以太網接口已成為未來網絡化測試設備的重要形式。本文在總結當前主流的PTP(Precision Time Protocol)硬件支持方式的基礎上,以Xilinx Zynq-7000 SOC作為硬件設計平臺,深入分析比較了基于該硬件平臺的三種PTP硬件支持方案,以通用性和可擴展性為主要考量因素,設計了一種基于PL(Programmable Logic)自研IP核實現千兆以太網下IEEE 1588協(xié)議的方案框架。本方案為搭建網絡通信鏈路,設計了基于FMC接口的千兆以太網PHY硬件電路和屏蔽底層影響的速率選擇與數據優(yōu)化IP核,并開發(fā)相應的通信測試工程測試了PHY與PS(Processing System)之間的通信功能。為完成PTP硬件支持,本方案在可編程邏輯器件中設計可配置實時時鐘和時間戳模塊,為上層設計提供了完備的時鐘調節(jié)接口,完成IEEE 1588實現亞微秒級同步精度所需的硬件支持,不要求在通信鏈路中配備支持硬件時間戳功能的PHY或MAC器件。上層設計采用在Linux操作系統(tǒng)中移植并優(yōu)化PTPd開源軟件并開發(fā)IP核設備驅動程序實現IEEE 1588狀態(tài)機和硬件時間戳獲取功能,本方案可以直接移植到包含可編程邏輯器件和支持Linux的微處理器的儀器控制架構中。在本方案的測試中,利用主從時鐘輸出秒脈沖信號(PPS),精確測試網絡節(jié)點設備的時鐘同步精度,本文從功能性和應用性兩方面對本方案同步精度進行測試,分析設備時鐘頻率偏移、分布時鐘節(jié)點數、交換機轉發(fā)次數以及網絡背景流量對同步精度的影響,驗證了在經多次交換機轉發(fā)并存在一定背景流量下的網絡化測試系統(tǒng)中保持各網絡節(jié)點設備亞微秒級同步精度的可行性。
[Abstract]:With the rapid development of network technology, Ethernet has been widely used in the field of testing for its advantages of universal protocol, long-distance transmission, flexible network topology and continuous development of network bandwidth. The networked automatic test system is mainly aimed at distributed testing tasks, compared with Ethernet applications. The precision of control operation and the timing correlation of data collected. IEEE 1588 protocol standard is an important way to realize precision synchronization of test equipment and test data in networked automatic test system. With the increasing of test complexity and test content, it is very difficult to adapt to the requirement of data transmission. Gigabit Ethernet interface has become an important form of networked test equipment in the future. On the basis of summing up the current mainstream PTP (Precision Time Protocol) hardware support methods and taking Xilinx Zynq-7000 SOC as the hardware design platform, this paper deeply analyzes and compares three kinds of PTP hardware support schemes based on this hardware platform. Taking generality and extensibility as the main consideration, a scheme framework for implementing IEEE 1588 protocol under Gigabit Ethernet based on PL (Programmable Logic) self-developed IP core is designed. In order to build the network communication link, the PHY hardware circuit of Gigabit Ethernet based on FMC interface is designed, and the rate selection and data optimization IP core of shielding the influence of the bottom layer are designed. The corresponding communication test project is developed to test the communication function between PHY and PS (Processing System). In order to complete PTP hardware support, this scheme designs configurable real-time clock and timestamp modules in programmable logic devices, provides a complete clock adjusting interface for the upper layer design, and accomplishes the hardware support required by IEEE 1588 to realize sub-microsecond synchronization precision. PHY or MAC devices that support hardware timestamp functionality are not required in communication links. The upper design adopts porting and optimizing PTPd open source software in Linux operating system and developing IP nuclear device driver to realize IEEE 1588 state machine and hardware timestamp acquisition function. This scheme can be directly transplanted to the instrument control architecture including programmable logic devices and microprocessors supporting Linux. In the test of this scheme, the clock synchronization accuracy of network node equipment is accurately tested by (PPS), which is used to output the second pulse signal from the master slave clock. The synchronization accuracy of this scheme is tested from the aspects of function and application. The effects of device clock frequency offset, number of distributed clock nodes, switch forwarding times and network background flow on synchronization accuracy are analyzed. The feasibility of maintaining the sub-microsecond synchronization accuracy of each network node equipment in the networked test system which is forwarded by multiple switches and has a certain background flow is verified.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TP393.11

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