高端路由器设备的时钟板设计与FPGA实现
发布时间：2018-09-04 08:46
【摘要】：同步以太网是一种基于物理层的时钟同步技术,能够很好地解决在网络1P化过程中,传统TDM业务与分组网络之间存在的同步与定时问题。单一的同步以太网只适用于没有时间同步要求的情况,而对于有时间同步要求的应用场景,则通常采用在同步以太网的基础上结合IEEE1588V2协议的方法来实现系统的高精度时间同步要求。基于IEEE1588V2的同步以太网解决了通用以太网延迟时间长且同步能力差的瓶颈,因此受到了业内人士的广泛关注。 本文首先研究了分组网络中的时钟同步和时间同步方式,选出了适合于本课题的同步以太网时钟同步方式和IEEE1588V2时间同步方式。接着,通过对高端路由器系统内的时钟同步和时间同步方案进行分析,提出了高端路由器设备中时钟板的功能和主要技术指标。随后,制定时钟板的总体设计方案,根据具体方案对芯片进行选型,并设计了各模块的硬件电路。最后,对时钟板上逻辑部分所要实现的功能进行分析,将逻辑划分为三级时钟处理、Localbus接口和时间同步处理3大模块,并对每个模块的实现方案和时序设计进行详细的说明,通过Modelsim仿真的方式验证了逻辑设计的正确性。
[Abstract]:Synchronous Ethernet is a kind of clock synchronization technology based on physical layer, which can solve the synchronization and timing problems between traditional TDM services and packet networks in the process of network 1P. A single synchronous Ethernet is only suitable for situations where there is no time synchronization requirement, whereas for applications with time synchronization requirements, Then the high precision time synchronization requirement of the system is usually realized by combining the synchronous Ethernet with IEEE1588V2 protocol. Synchronous Ethernet based on IEEE1588V2 solves the bottleneck of long delay time and poor synchronization ability of general Ethernet, so it has been widely concerned by the industry. In this paper, the clock synchronization and time synchronization in packet networks are studied, and the synchronous Ethernet clock synchronization mode and IEEE1588V2 time synchronization mode are selected. Then, through the analysis of the clock synchronization and time synchronization schemes in the high-end router system, the functions and main technical specifications of the clock board in the high-end router equipment are put forward. Then, the overall design of the clock board is made, the chip is selected according to the specific scheme, and the hardware circuit of each module is designed. Finally, the function of the logic part on the clock board is analyzed, and the logic is divided into three modules: the local bus interface and the time synchronization, and the implementation scheme and timing design of each module are explained in detail. The correctness of logic design is verified by Modelsim simulation.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.11
本文编号：2221588
[Abstract]:Synchronous Ethernet is a kind of clock synchronization technology based on physical layer, which can solve the synchronization and timing problems between traditional TDM services and packet networks in the process of network 1P. A single synchronous Ethernet is only suitable for situations where there is no time synchronization requirement, whereas for applications with time synchronization requirements, Then the high precision time synchronization requirement of the system is usually realized by combining the synchronous Ethernet with IEEE1588V2 protocol. Synchronous Ethernet based on IEEE1588V2 solves the bottleneck of long delay time and poor synchronization ability of general Ethernet, so it has been widely concerned by the industry. In this paper, the clock synchronization and time synchronization in packet networks are studied, and the synchronous Ethernet clock synchronization mode and IEEE1588V2 time synchronization mode are selected. Then, through the analysis of the clock synchronization and time synchronization schemes in the high-end router system, the functions and main technical specifications of the clock board in the high-end router equipment are put forward. Then, the overall design of the clock board is made, the chip is selected according to the specific scheme, and the hardware circuit of each module is designed. Finally, the function of the logic part on the clock board is analyzed, and the logic is divided into three modules: the local bus interface and the time synchronization, and the implementation scheme and timing design of each module are explained in detail. The correctness of logic design is verified by Modelsim simulation.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.11
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