pcie事务层中的HEAD1HEAD2HEAD3

在PCIe事务层中，HEAD1、HEAD2和HEAD3是用来标识事务类型的字段。HEAD1字段包含了事务的类型和请求方向信息，HEAD2字段包含了事务的请求类型和请求方向信息，HEAD3字段包含了事务的请求类型和请求方向信息。这些字段的具体含义可以在PCIe规范的相关章节中找到详细的解释。\[1\]
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