Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Agreed with wy21century. Synopsys Design Compiler would have the command set_dont_touch.
you have to 'set_dont_touch' on the flops you do not want to put in scan chain.
Hope it helps