LMK01801: Error in IBIS model

Hi Lane,

I re-downloaded the IBIS model and tried opening the IBIS model in Hyperlynx simulation software (Hyperlynx LineSim VX.2.7). I couldn't open the ibis model and I got following error:

X:\binayak_hyperlynx_folder\library_models\from_dvb_sim_models\models_related\sipi\models\clocks_related\4-LMK01801BISQE-snam094\LMK01801_IBIS\lmk01801.ibs:
    Error :  at line 372 in file X:/binayak_hyperlynx_folder/library_models/from_dvb_sim_models/models_related/sipi/models/clocks_related/4-LMK01801BISQE-snam094/LMK01801_IBIS/lmk01801.ibs : Messages for model UWIRE_DIN:
        ;;    Error: Vinl and Vinh must satisfy Vinh >= Vinl.
    Warning :  at line 7429 in file X:/binayak_hyperlynx_folder/library_models/from_dvb_sim_models/models_related/sipi/models/clocks_related/4-LMK01801BISQE-snam094/LMK01801_IBIS/lmk01801.ibs : Component [LMK01801BISQ] specifies pin model UWIRE_DIN which does not exist in this file or contains errors.  Using NC model.
    Warning :  at line 7429 in file X:/binayak_hyperlynx_folder/library_models/from_dvb_sim_models/models_related/sipi/models/clocks_related/4-LMK01801BISQE-snam094/LMK01801_IBIS/lmk01801.ibs : Component [LMK01801BISQ] specifies pin model UWIRE_DIN which does not exist in this file or contains errors.  Using NC model.
    Warning :  at line 7429 in file X:/binayak_hyperlynx_folder/library_models/from_dvb_sim_models/models_related/sipi/models/clocks_related/4-LMK01801BISQE-snam094/LMK01801_IBIS/lmk01801.ibs : Component [LMK01801BISQ] specifies pin model UWIRE_DIN which does not exist in this file or contains errors.  Using NC model.
    Error : Parse failed on file X:/binayak_hyperlynx_folder/library_models/from_dvb_sim_models/models_related/sipi/models/clocks_related/4-LMK01801BISQE-snam094/LMK01801_IBIS/lmk01801.ibs.

I am attaching the snapshot of the same.

Thanks n Regards,

Binayak

Hi Binayak,

I'm checking the errors in the model from that loading message. The error at line 372 indicates " Vinl and Vinh must satisfy Vinh >= Vinl" and Vinh is shown as 1.6V >= Vinl = 0.4V. 

There also appear to be warnings indicating UWIRE_DIN does not exist when it is indeed included in the model

When I check using the built in parsers for IBIS spec and HyperLynx, it passes both compatibility checks. It's not clear why the model is having errors. 

Kind regards,
Lane

Hi Lane,

May I know which hyperlynx version are you using? Is it opening fine in your hyperlynx version?

Thanks n Regards,

Binayak

Hi Binayak,

I use HyperLynx LineSim v9.4, it opens fine in this version. Perhaps there is a compatibility issue.

I can put in a request to update the IBIS model using the error message you provided

Kind regards,
Lane

HI Lane,

Kindly update the model. I'm facing the same issue in Hyperlynx version 2.6 too.

Thanks,

Binayak

Hi Binayak,

Just to confirm, do you receive the same error message in version 2.6?

I'd like to provide as much information as possible in the model update request to get it fixed quickly.

Kind regards,
Lane

Hi Lane,

Yes. I got the same error message.

Kind Regards,

Binayak

Hi Lane,

Any updates on this issue?

Regards,

Binayak

Hi Binayak,

I just spoke with the modeler. It appears the issue is indeed related to Vinh/Vinl at line 144/145. Can you swap the values so that Vinh = 1.6V and Vinl = 0.4V and confirm that you no longer are seeing the error messages?

Kind regards,
Lane

Hi Lane

I changed VIH and VIL per your recommendation it seems to fix some issue but still see lot of error when use ADS load the ibis model.  Please see error below

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 1.484831e-18 at row 5 col 21 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 4.695805e-19 at row 5 col 24 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 8.578029e-18 at row 5 col 25 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 4.397096e-18 at row 5 col 26 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 9.479656e-18 at row 5 col 27 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 9.077547e-19 at row 5 col 28 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 2.058033e-18 at row 5 col 32 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 6.024868e-18 at row 5 col 39 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 7.996306e-19 at row 6 col 21 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 1.102094e-18 at row 15 col 30 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 1.111699e-18 at row 29 col 48 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 3.894905e-18 at row 30 col 48 which is positive

ERROR - Package llp48_lmk01801_base: The Capacitance Matrix has off-diagonal element 3.090883e-18 at row 30 col 49 which is positive

Hi Lane and Sam,

When I do the VIH and VIL changes as suggested by Lane, I don't get any errors in Hyperlynx. Hyperlynx is not spilling out error message as Sam is saying ADS does.

Is the model correct or some issues are still there with this model?

Regards,

Binayak

Hi TI technical support

Can you help to answer my previous question?  The error on ADS simulation not Hyperlynx.

Thanks
Sam Liu

Hi,

This updated model is fine for HyperLynx but we will put in the request to fix the model for ADS too. I have confirmed it for HyperLynx 9.4 but I do not use ADS simulator.

Binayak,

We originally planned to release this updated model to the web, but now we will try to fix it for ADS beforehand. Binayak, you can use your updated version of the model in the meantime. When we have the model ready with that update, I would ask that you can simulate it with no errors.

Sam,

I'll use this error message when updating the IBIS model update request

Kind regards,
Lane

Sam,

which simulator and version do you use?

Kind regards,
Lane