riddhi.kapasi
Newbie level 6

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.
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.