synopsys scan insertion
Scan Replacement/Insertion:
-- Synopsys: DFT Compiler
-- Cadence: BuildGate or RTL Compiler
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Scan Stitching:
-- Synopsys: Design Compiler or Physical Compiler
-- Cadence: PKS or FE
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ATPG: (automatic test pattern generation)
-- Synopsys: TetraMax
-- Cadence: Encounter Test
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IMHO, " someone tell me , cadence scan function isn't good" means its scan insertion/stitching is not as flexible as Synopsys' one.
Since PKS or FE can only do scan-reordering while PC(w/ DFT Compiler) can do scan ordering.
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Encounter Test is also an excellent ATPG tool, see below.
https://www.cadence.com/products/digital_ic/encountertest/index.aspx