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Scan compression structure using DFTC

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pete_lu

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Hi guys,
I meet a problem when I using scan compression HPDF structure.
First I insert scan on Sub block (using scan compression).
Second I want to insert scan on TOP hybrid (using scan compression).
The problem occurs:
What I want is to stitch the scan chains of Sub to the hookup point on TOP,
but the result is some logic (like MUX) has been inserted between sub scan chain (input/output) and hookup points.
Anybody know the problem?
Note: I already specified the hookup point, even I use set_scan_path to specify the sub scan chains. But when TOP compression, logics still be inserted unfortunitly.
 

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