Where can we find the Doc 《平 头哥产品ID 定义规范（5.0 版）》?

[hotislandn]

Hello,

In the spec, you mentioned a doc to decode the reg "MCPUID":
17.6.8 处理器型号寄存器（MCPUID）
处理器型号寄存器（MCPUID）存储了处理器型号信号，其复位值由产品本身决定，具体定义遵循**《平
头哥产品ID 定义规范（5.0 版）》**。

But, where can we find it? Is it a public file in some where?
Thanks.