本OCP2.0转接卡针脚定义参照https://www.opencompute.org/ SPEC, MEZZ, OCP Mezzanine 0.5 Specification v0.5文档设计，单独增加设计5v电路与风扇接口与风扇调速开关
相关文档链接https://www.opencompute.org/documents/ocp-mezzanine-05-specification

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