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how to do STA( Static timing analysis) in test mode?

diablo

I am using MMMC setup for timing analysis. Due to our VDIO license, we can do only Multi corner and not Multi mode.

I have been trying to understand how to do STA in test mode. We have IO pin <TEST_EN> if pulled high will put the chip in ATPG mode.

To do STA for both funtional and test,  I am assuming i need different SDC file for funtional and test( functional.sdc and test.sdc). Then use create_constraint_mode in MMMC setup as

create_constraint_mode -name FunctConstMode -sdc_files functional.sdc

create_constraint_mode -name TestConstMode -sdc_files test.sdc

My first question is do i need to create view separately for these two modes like

 create_analysis_view -name typical_func -constraint_mode  FunctConstMode -delay_corner typdc
 create_analysis_view -name typical_test -constraint_mode  TestConstMode -delay_corner typdc

and before doing STA, set the view to do STA in func mode using

set_analysis_view -setup worst_func -hold best_func

and change the view to do STA in test mode using

set_analysis_view -setup worst_test -hold best_test

Is this the correct way?

If it is, how do i tell the tool to pull the TEST_EN high during STA in test mode. Is it enough to just set_false_path for the path not executed in test mode in test.sdc?

Thanks for your time and help. 

 

 

 
Parents

  • I found out i was running the correct flow. Now i am able to run multi mode by

    set_analysis_view -setup{worst_func worst_test} -hold {best_func best_test}

    The command i was looking for to do the timing analysis with TEST_EN high in test.sdc is "set_case_analysis 1 [get_pin TEST_EN]" 

     

Reply

  • I found out i was running the correct flow. Now i am able to run multi mode by

    set_analysis_view -setup{worst_func worst_test} -hold {best_func best_test}

    The command i was looking for to do the timing analysis with TEST_EN high in test.sdc is "set_case_analysis 1 [get_pin TEST_EN]" 

     

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