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I didn't find any link to search this phrase.. Please show me here any specific link to understand that this a is top-level design for the evaluation board. Thanks in advance.
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The term "golden" is often used when discussing testbenches, and represents the "known-good" response to stimulus.
I assume that "golden top" is just an extended use of this terminology, to indicate that the example design is a "known-good" top-level design for the board.
However, as I comment ... it is always good judgement to compare the golden-top to a schematic to confirm the design really is "golden" :)
Cheers,
Dave