This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TNETV2520 - VI, VIP and IBIS

Hello,
Wei would like to confirm some items about TNETV2520 electrical characteristics.

Our customer is currently checking the electrical characteristics on TNETV2520 Data Manual and TNETV2520 IBIS model. But, they found unclear information and mistake on these materials. So, could you please advise for the questions below.


1) VI, VIP symbols in the Table 4-1: Absolute Maximum Ratings in the Data Manual:
   Which pins do VI and VIP symbols represent respectively ?


2) Accuracy of TNETV2520  IBIS model:
According to the IBIS model, the voltage level is defined as 3.3V (on model name "BQ0098G"), while the Data Book describes the voltage level as 2.5V in the Table 4-2:
Recommended Operating Conditions.
So, they think that the IBIS model has mistakes in the DDR signals. In addition, it may have similar mistakes in other parts.
Could you please recheck the accuracy of the IBIS model ?

Thanks,
Amir

  • Hi Amir,

    The TNETV Products are customised DSP's with the VOIP software running on them.
    The proprietary nature of these chip-sets makes it difficult to disclose all of the inner workings.

    There are three parties involved with the TNETV products. Hardware, Software and the Intergration of the two.

    Hardware--> TI
    Software for VOIP and QoS--> Telchemy
    Getting it to work together--> Intergrator of choice

    From there, you would need to contact Telchemy for thier software to run on the chip. You can either get the entire suite from them or you can just get VQMON. http://www.telchemy.com/vqmonep.html

    Then with your hardware+software, you would need to contact an intergrator to get the software onto the chip for evaluation.
    There is a list of 3rd party intergrators that have worked with both Telchemy and the hardware.

    http://focus.ti.com/dsp/docs/thirdparty/catalog/embeddedsoftwarefulldetails.tsp?productId=759

    Thanks & regards,

    Sivaraj K

  • Hi Sivaraj,

    I want to add more about this question from Amir.

    The questions are HW related and not SW related, so I think that TI should handle such questions.

    The 1st question is regarding unclear symbols in the Data-manual:

     VI, VIP symbols in the Table 4-1: Absolute Maximum Ratings in the Data Manual:
       Which pins do VI and VIP symbols represent respectively ?

    The 2nd question is regarding the IBIS model file:

    According to the IBIS model, the voltage level is defined as 3.3V (on model name "BQ0098G"), while the Data Book describes the voltage level as 2.5V in the Table 4-2:
    Recommended Operating Conditions.
    So, they think that the IBIS model has mistakes in the DDR signals. In addition, it may have similar mistakes in other parts.
    Could you please recheck the accuracy of the IBIS model ?

    The 3rd question is also related to the IBIS model:

    Can TI tell us the package RLC information ?

    The IBIS model has no information for RLC as below;

     [Package] 

    |

    | Variable     Typ           Min           Max

    R_pkg          0.0           0.0           0.0     

    L_pkg          0.0           0.0           0.0   

    C_pkg          0.0           0.0           0.0

    Thanks,

    Eliezer 

  • Hi,

    I'd like adding another finding regarding the IBIS model accuracy:

    There are strange characteristics on A10(IC33SHY) & A11(IC33SHYPU) pin during the simulation.

    When simulating these pins using the IBIS model, although the input signal is at 3.3 V, the amplitude is around 2.3 V.  (the GND_clamp characteristics on these pins limits signal level to around 2.3 V, when positive current flows.)

    We think that the amplitude should be obtained at 3.3 V, when signal at 3.3 V is input.

     Could you please recheck if the characteristics are correct on A10 & A11 pins ?

    Thanks,

    Eliezer 

  • Eliezer,

    Following up on this older post, as it was brought to my attention that it's still open. All collateral for the TNETV2520 has been final now for several years and is not under any maintenance. We will not be able to provide any updates to the IBIS model.

    Best regards,
    Dave