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TMDS181: IBIS-AMI Simulation

Kawai
Guru 19785 points
Part Number: TMDS181

Hello Team,

Please allow me to ask you about TMDS181 IBIS-AMI simulation.

Q1). Is there a model which can enable De/Pre-Emphasis function of TMDS181 ?  Current IBIS-AMI model could simulate without Emphasis function.
Please tell us how we can do this if it is already available.

Q2). Is package model available ? It seems it is not included in the current model.
Please tell us the model name if it is already available in the current model.

Q3). We would like you to check the customer output waveform simulation result. One of the result differs from others. 

Could you please send me an email to following email address so that I could share the simulation result ?

Best Regards,

Kawai

  • 0
    TI__Guru* 76130 points
    Hello,
    We are looking for this information and we'll reply shortly.
    Regards
  • 0
    TI__Genius 11280 points

    Hello,

    Please send yours files to Gerardo.leyva@ti.com   

    Regards,

    Gerardo

  • 0 in reply to Gerardo
    TI__Genius 11280 points

    Hello Kawai,

    Please see the answers below:

    Q1) Unfortunately, the De/Pre-emphasis function is not incorporated into the model.
    Q2) No, the package model is not available.
    Q3) That seems odd to us as well. The characteristic of 6 Gbps with slew_cntrl:0 should be similar to other setting cases (slew_ctr: 1 and 2). I’ve run some simulations myself but could NOT duplicate what you reported. Can you please double check your simulation set up to make sure everything is same except for slew_ctr bit?

    Regards,

    Gerardo

  • 0 in reply to Gerardo
    Guru 19785 points
    Hello Gerardo-san,

    Q1) Q2) I understood

    Q3) I will confirm customer simulated settings. Could you please send us your simulation schematic and the result ?

    Best Regards,
    Kawai
  • 0 in reply to Kawai
    Guru 19785 points
    Hello Gerardo-san,

    I will send you customer simulation result by email. Could you please confirm and also send us your simulation result ?

    Best Regards,
    Kawai
  • 0 in reply to Kawai
    TI__Genius 11280 points

    Hello Kawai,

    Unfortunately, the model was based on the simulated data. We have no correlation result with the lab measurement.

     

    Please see simulation results at 6 Gbps for SLEW_CTL: 0, 1, 2.

    Regards,

    Gerardotmds181_results.pdf

  • 0 in reply to Gerardo
    Guru 19785 points

    Hello Gerardo-san,

    Thank you for your continuous support. I understood that TI can simulate correctly.

    I have two questions.

    Q1).  Could you please show us the ADS simulation schematic, so that customer could try exact the same simulation ?

    Q2).  Could you please double check if this model is correct ? Customer says that "tx_hf_fe_termination.s4p" model seems to has wrong characteristic.I am attaching the file.

    3580.tx_hf_fe_termination.zip

    Best Regards,

    Kawai

  • 0 in reply to Kawai
    TI__Genius 11280 points

    Hello Kawai,

    The eLab was able to reproduce the customer issue and found the termination model tx_hf_fe_termination.s4p as the root cause. We owe the customer an apology for that. The advice for the customer is to use the tx_hf_me_termination.s4p model which should have similar characteristics as correct tx_hf_fe_termination.s4p.

    Regards,

    Gerardo

  • 0 in reply to Gerardo
    Guru 19785 points
    Hello Gerardo-san,

    Thank you for your support, I understand that the model had an error.

    What do you mean by "The advice for the customer is to use the tx_hf_me_termination.s4p model which should have similar characteristics as correct tx_hf_fe_termination.s4p." ?

    Please advise us in detail how we can simulate high frequency/high edge characteristic ?


    Best Regards,
    Kawai
  • 0 in reply to Kawai
    TI__Genius 11280 points

    Hi Kawai,

    Please see the attached ADS simulation.

    Regards,

    Gerardo

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/TMDS181_5F00_RELEASE_5F00_ADS_5F00_17APR2017.7zads

  • 0 in reply to Gerardo
    Guru 19785 points
    Hello Gerardo-san,

    Sorry for my delay to your reply.

    We had tried simulating your ads file, however, due to lack of "4mil_8inch.s4p" information, we could not simulate the result based on your ADS schematic.

    Can you double check if the file includes all the models ?

    Best Regards,
    Kawai