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Encounter 8.1 vs 9.1 sdf generation

MzQuarter

Hi,

I've used Encounter 8.1 for past projects to generate sdf back-annotation for simulation and it worked great. Now we've moved to Encounter 9.1, but the exact same 8.1 encounter project reloaded in 9.1 gives different results. First of all, the middle field ("typical", my guess) is no longer present, and when I load the sdf in a simulator the delays are all taken as 0 (no delays).  Second, the delays for interconnect are different, and quite often 0. Another difference I noticed is that in 8.1 the value triplets were always the same (which I thought odd), but not in encounter 9.1.

What am I missing? I'm almost sure it's just a setting, but I can't see where or how.

Thanks.

--------------------------------------------------------------------------------
Encounter 8.1:

(INTERCONNECT I_NCS U134/A (0.0037:0.0037:0.0037) (0.0037:0.0037:0.0037))
(INTERCONNECT I_SCLK Q_TRANSACTIONCOMPLETE_REG/CKN (0.0045:0.0045:0.0045) (0.0045:0.0045:0.0045))

Encounter 9.1:

(INTERCONNECT I_NCS U134/A  (0.003::0.004) (0.003::0.004))
(INTERCONNECT I_SCLK Q_TRANSACTIONCOMPLETE_REG/CKN  (0.000::0.000) (0.000::0.000))

Parents

  • Hi Diablo and Martinage,

    I had some time to come back to this problem, and found what I was looking for thanks to your help and pointers. Here is what I did:

    The project comes with wcbc already setup, so I added a typical view in MMMC by following the user guide chapter on MMMC (this thread: http://www.cadence.com/Community/forums/p/11116/13162.aspx).

    In the following lines, "default_mode_setup" and "default_mode_hold" already existed in  my project (bcwc), and point to the same .sdc file. "default_view_setup" and "default_view_hold" were also already defined.

    create_library_set -name typical_libraries -timing {tt_1p5v_25c.lib} -si {tt_1v50_c25.cdB}
    create_rc_corner -name typical_rc_corner -cap_table "typ.capTbl" -T -25 -qx_tech_file "typ.tch"                                                 
    create_delay_corner -name typical_delay_corner -library_set typical_libraries -rc_corner typical_rc_corner
    create_analysis_view -name typical_analysis_view -delay_corner typical_delay_corner -constraint_mode default_mode_setup

    then:
    set_analysis_view -setup {default_view_setup typical_analysis_view} -hold {default_view_hold typical_analysis_view}

    and lastly
    write_sdf -version 2.1 -typ_view typical_analysis_view -min_view default_view_hold -max_view default_view_setup test.sdf

    I quickly checked an entry in the sdf file before and after these, and the early/late entries are unchanged, with new entries in the center field that make sense to me, so I think at worst I didn't break anything.

    Again, thanks to both of you for your help.

    Mz

Reply

  • Hi Diablo and Martinage,

    I had some time to come back to this problem, and found what I was looking for thanks to your help and pointers. Here is what I did:

    The project comes with wcbc already setup, so I added a typical view in MMMC by following the user guide chapter on MMMC (this thread: http://www.cadence.com/Community/forums/p/11116/13162.aspx).

    In the following lines, "default_mode_setup" and "default_mode_hold" already existed in  my project (bcwc), and point to the same .sdc file. "default_view_setup" and "default_view_hold" were also already defined.

    create_library_set -name typical_libraries -timing {tt_1p5v_25c.lib} -si {tt_1v50_c25.cdB}
    create_rc_corner -name typical_rc_corner -cap_table "typ.capTbl" -T -25 -qx_tech_file "typ.tch"                                                 
    create_delay_corner -name typical_delay_corner -library_set typical_libraries -rc_corner typical_rc_corner
    create_analysis_view -name typical_analysis_view -delay_corner typical_delay_corner -constraint_mode default_mode_setup

    then:
    set_analysis_view -setup {default_view_setup typical_analysis_view} -hold {default_view_hold typical_analysis_view}

    and lastly
    write_sdf -version 2.1 -typ_view typical_analysis_view -min_view default_view_hold -max_view default_view_setup test.sdf

    I quickly checked an entry in the sdf file before and after these, and the early/late entries are unchanged, with new entries in the center field that make sense to me, so I think at worst I didn't break anything.

    Again, thanks to both of you for your help.

    Mz

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