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0 internal test pattern generated after insert_dft using DC

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riddhi.kapasi

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I tried to insert scan in my rtl. My dft_drc report shows:

Pattern Summary Report
-----------------------------------------------
#internal patterns 0
-----------------------------------------------


Uncollapsed Stuck Fault Summary Report
-----------------------------------------------
fault class code #faults
------------------------------ ---- ---------
Detected DT 1313200
Possibly detected PT 0
Undetectable UD 127205
ATPG untestable AU 120
Not detected ND 813
-----------------------------------------------
total faults 1441338
test coverage 99.93%
-----------------------------------------------

Why is #internal patterns : 0 ?

What does internal patterns means?

Some understanding will be really appreciated.
Thanks.
 

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