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Fix scan chain violation : non scan DFF disturbed during shift procedure (S19-1)

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david_art_fong

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Hi,

I ran dft_drc -coverage
to check estimated fault coverage.

but got this violation

warning : no scan DFF i_xyz disturbed during time 45 of shift procedure (S19-1).

how to fix this violation as the DFF
is a custom cell with an enable but no scan equivalent cell for auto fix replacement ?

should I add a gate to disable enable during scan enable ?
 

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