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RC could not find scan equivalent cell

Lamech
Hi, I am a relatively new to cadence tools. I am trying to insert scan chain into my design. But getting the following error... "Could not find a scan-equivalent cell. DFT-510. I have added the test_cell group as specified in the documentation. Also I have set dont_use, dont_touch attributes to false in .lib file. In the RC tcl file I have set "set_attribute preserve false SCANFF" and "set_attribute avoid false SCANFF". I have tried both Muxed scan style and LSSD scan style with different cells. Can some one tell me what could be the problem? or any suggestions on scan chain design in cadence? Kind of show stopper in our project, so any help will be highly appreciated... Thanks in Advance, Charles
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