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How to synthesize without scan cell replacement

Maso

Hi,

 I synthesize RTL with RTL Compiler.

I have setup below options.

set_attr dft_connect_scan_data_pins_during_mapping ground [find / -design *]
set_attr dft_connect_shift_enable_during_mapping tie_off [find / -design *]
set_attr dft_scan_map_mode preserve [find / -design *]

But when I finished synthesis, I always get my netlist with scan cells replacement.

How can I avoid the scan cells replacement ?

 Thanks a lot.

Parents

  • Sorry for mixing two case.

    The original case -

    I set below option to do synthesis: 

    set_attribute optimize_constant_0_flops false /
    set_attribute optimize_constant_1_flops false /

    LEC can pass.

    And then I use DC DFT to insert scan chain.

    Formality fail for synthesis netlist and dft netlist.

    As mentioned in last mail, it's work to avoid scan cell replacement by using "set_attr use_scan_seqs_for_non_dft false /".

    I have re-run formality to check the result, and it can pass.

    Another case -

    I set optimize_constant to true.

    LEC fail.

    In this case, I have tried -effor high but it's no use.

    I will file a 'service reqest' on support.cadence.com later.

    You help me a lot. 

    Thanks for your help very much.

Reply

  • Sorry for mixing two case.

    The original case -

    I set below option to do synthesis: 

    set_attribute optimize_constant_0_flops false /
    set_attribute optimize_constant_1_flops false /

    LEC can pass.

    And then I use DC DFT to insert scan chain.

    Formality fail for synthesis netlist and dft netlist.

    As mentioned in last mail, it's work to avoid scan cell replacement by using "set_attr use_scan_seqs_for_non_dft false /".

    I have re-run formality to check the result, and it can pass.

    Another case -

    I set optimize_constant to true.

    LEC fail.

    In this case, I have tried -effor high but it's no use.

    I will file a 'service reqest' on support.cadence.com later.

    You help me a lot. 

    Thanks for your help very much.

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