My two cents......

What is an interconnect?  It is an electrical connection between point A
and B.  This can be accomplished by a PTH, blind via, buried via or even a
trace.  Therefore, my interpretation to HDI is any interconnect structure
that would provide high wiring density.  In most cases today, HDI involves
the use of microvia and/or blind/buried via.  However, if you have a
process to do 1 mil line/space, I would consider it to be HDI as well.

Mason Hu

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