插件化的IPMC板卡管理系统硬件设计

虽然目前作为服务器管理核心的IPMC的设计日趋成熟,但是IPMC仍然是以直接焊接在服务器主板之上的“一体化”形式设计,在硬件更新维护方面具有极高的复杂度。在此背景之下,本文提出“硬件插件化”思想,将IPMC以金手指的硬件接口形式制作成可插入式的板卡,该板卡不仅可以解决上述所提到的问题,还具备千兆以太交换功能。板卡硬件主要由Cortex-M4内核的单片机MSP432E401Y和二层以太交换芯片KSZ9897R构成,为解决板卡间以太网通信的硬件冗余问题,本设计采用了无变压器以太网电路互连。经HFSS软件对过孔参数的仿真优化及板卡间高速信号的眼图以及S参数测试,结果表明本文所设计的插件化板卡硬件在传输千兆速率信号时,最大电压损耗为3.5dB,回波损耗皆大于10dB,完全满足IEEE802.3标准对于以太网信号的损耗要求。

Hardware design of plug-in IPMC board management system

Although the design of IPMC as the core of server management is becoming more and more mature, IPMC is still designed in the form of "integration" directly welded on the server motherboard, which has a high complexity in hardware update and maintenance. In this context, this paper puts forward the idea of "hardware plug-in", which makes IPMC into a pluggable board in the form of golden finger hardware interface. This board can not only solve the problems mentioned above, but also has Gigabit Ethernet switching function. The board hardware is mainly composed of microcontroller MSP432E401Y and L2 Ethernet switch chip KSZ9897R. In order to solve the hardware redundancy problem of Ethernet communication between boards, this design uses a transformerless Ethernet circuit interconnection. After the simulation and optimization of via parameters by HFSS software and the eye diagram and S-parameter test of high-speed signals between boards, the results show that the plug-in board hardware designed in this paper has a maximum voltage loss of 3.5dB when transmitting gigabit rate signals. The return loss is greater than 10dB, which fully meets the loss requirements of the IEEE802.3 standard for Ethernet signals.