In SCAN Flip-flop, DO we require to feed muxes externally id i am using MUX-D flops?

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deepen talati

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In scan insertion, tool convert the design flip-flop in Scan flip-flop. Already we have bunch of flops in design. So no need to insert extra flops. Is it same for MUX also if i am using MUX-D flops scan cells. Have we enough amount of MUX such that we don't need to insert extra muxes or we have to insert extra muxes externally?
 

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