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How to run DC DFT for bottom-up syn

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tigerajs

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syn some blocks , BLK1.BLK2,BLK3 and do DFT，DFT input is scan_si,scan_en, and out is scan_so. And do the syn of the top module ，use 2 way to get 2 results
（1）Use BLK1.BLK2,BLK3 ddc as library to read ，then set_dont_touch BLK1.BLK2,BLK3, after syn to get coverage ，only 38%。 BLK1. BLK2, BLK3 port has no change.
（2）Read BLK1.BLK2,BLK3 netlist，then set_dont_touch BLK1.BLK2,BLK3,after syn to get coverage 99%,but BLK1. BLK2, BLK3 port add test_si,test_so.And scan_si, scan_so will no function


How to modify it , thanks
 

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