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DRA74P: DRA742AHGABCRQ1: The HDMI output in the buffer model is not correct during simulations.

Pavan Kumar Kandula
Prodigy 30 points
Part Number: DRA74P


Hi,

The IBIS model received for DRA74x series has issue with HDMI output Buffer Model.

 

The voltage received at receiver pin is in nano or micro volts. Even with a 100 Ohm termination the voltage levels are not better as tested using Hyperlynx Linesim.

From the IBIS model:

| IBIS file generated by GenIBIS323.exe Version 3.23

|************************************************************************

|                       DRA74x75x

|************************************************************************

[IBIS ver]      5.0

[File name]     DRA74x75x.ibs

[File Rev]      1.3.4

[Date]          Mon Apr 15, 2014, 10:23:51

[Source]        Data created at Texas Instruments

[Notes]         DRA74x75x 23mm IBIS Model Revision History

                  DRA74x75x Version 1.3.4, June 9th, 2014

                  - Created DRA74x75x version from parent device

                  Version 1.3.4, April 15, 2014

                  - Added new 1-2-1 package RLC data

                  Version 1.3.3, September 20, 2013

                  - Updated the following models to more accurately

                    represent the slew and delay characteristics.

                    * Models include:

                      > bc1833dv40dcpbfbhhvrxp1811_sscev

                      > bc1833dv40dcpbfbp1811_ssceh

                      > bc1833dv40dcpbfbp1811_sscev

                      > bi2c1833dvfzp18_sscev

                      > iq1833dvtckpbfbp18ll_sscev

Could you verify the IBIS model and provide if there is any updated buffer model for HDMI simulations.

There is a case created: #CS1635313

Thank you in advance.

Best Regards,

Pavan

  • 0
    TI__Guru 55447 points

    Pavan,

    The IBIS model for HDMI has known issues, and is not recommended to be used.  Instead, the customer should follow the Layout guidelines in the device Data Manual.  The layout guidelines have been derived based on extensive simulation by TI, along with extensive validation and will lead to the best implementation for the customer.

    Regards,

    Kyle