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X propagation through scan chain in compression technique

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Shankhy

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Hi,

If X is propagating in the scan output channel, how to know which scan chain is propagating X since there are more than one scan chains being compacted in the same scan channel.

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Shankhy
 

dpaul

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Trace back your signal and find out from where is the X being propagated.
Dft experts might have a better answer!
 

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