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Setting Timing Derate

tshovon123

 Hi I am shovon

New to encounter. So facing syntax related problem .

How can i apply diffrent derating factors for setup and hold in OCV.

 

 

It will be helpful if anyone elaborate about setting different derating factors according to mode and check type for a particular delay corner. That is I want to set different derating factor for different analysis view. 

 

Thanks

Tanvir Hasnain Shovon 

Parents

  •  Hi Tanvir

     Once you create the analysis views (Cadence doc attached), you can use something like this for applying OCV derating:

     

    ________viewDefinition.tcl________

    #create library sets

    create_library_set -name lib_slow -timing {./slow_test.lib}

    create_library_set -name lib_fast -timing {./fast.lib}

     

    #create Constraint Modes

    create_constraint_mode -name mode_mission -sdc_files {./default.sdc}

     

    #create RC Corners

    create_rc_corner -name rc_slow

    create_rc_corner -name rc_fast

     

    #create Delay Corners

    create_delay_corner -name dc_slow \

    -late_library_set lib_slow \

    -early_library_set lib_fast \

    -late_opcond_library slowlib \

    -early_opcond_library fastlib \

    -late_opcond slow \

    -early_opcond fast

     

    create_delay_corner -name dc_fast \

    -late_library_set lib_slow \

    -early_library_set lib_fast \

    -late_opcond_library slowlib \

    -early_opcond_library fastlib \

    -late_opcond slow \

    -early_opcond fast

     

    #create analysis views

    create_analysis_view -name view_slow_mission -constraint_mode mode_mission -delay_corner dc_slow

    create_analysis_view -name view_fast_mission -constraint_mode mode_mission -delay_corner dc_fast

     

    #set current analysis views

    set_analysis_view -setup {view_slow_mission} -hold {view_fast_mission}

     

    # Apply OCV derating (5% for eaxample)

    set_timing_derate -delay_corner  dc_slow -early 0.95

    set_timing_derate -delay_corner  dc_slow -late 1.00

    set_timing_derate -delay_corner  dc_fast -early 1.00

    set_timing_derate -delay_corner  dc_fast -late 0.95 

     

     Thanks

    Khandaker 

    Timing and Mode Setup.v1.pdf
Reply

  •  Hi Tanvir

     Once you create the analysis views (Cadence doc attached), you can use something like this for applying OCV derating:

     

    ________viewDefinition.tcl________

    #create library sets

    create_library_set -name lib_slow -timing {./slow_test.lib}

    create_library_set -name lib_fast -timing {./fast.lib}

     

    #create Constraint Modes

    create_constraint_mode -name mode_mission -sdc_files {./default.sdc}

     

    #create RC Corners

    create_rc_corner -name rc_slow

    create_rc_corner -name rc_fast

     

    #create Delay Corners

    create_delay_corner -name dc_slow \

    -late_library_set lib_slow \

    -early_library_set lib_fast \

    -late_opcond_library slowlib \

    -early_opcond_library fastlib \

    -late_opcond slow \

    -early_opcond fast

     

    create_delay_corner -name dc_fast \

    -late_library_set lib_slow \

    -early_library_set lib_fast \

    -late_opcond_library slowlib \

    -early_opcond_library fastlib \

    -late_opcond slow \

    -early_opcond fast

     

    #create analysis views

    create_analysis_view -name view_slow_mission -constraint_mode mode_mission -delay_corner dc_slow

    create_analysis_view -name view_fast_mission -constraint_mode mode_mission -delay_corner dc_fast

     

    #set current analysis views

    set_analysis_view -setup {view_slow_mission} -hold {view_fast_mission}

     

    # Apply OCV derating (5% for eaxample)

    set_timing_derate -delay_corner  dc_slow -early 0.95

    set_timing_derate -delay_corner  dc_slow -late 1.00

    set_timing_derate -delay_corner  dc_fast -early 1.00

    set_timing_derate -delay_corner  dc_fast -late 0.95 

     

     Thanks

    Khandaker 

    Timing and Mode Setup.v1.pdf
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