[FAQ] AM625 / AM623 / AM625SIP / AM625-Q1 / AM620-Q1 / AM62A7 / AM62A3 / AM62P / AM62P-Q1/ AM6442 / AM2432 Custom board hardware design – S-parameter and IBIS model of IO-buffer

Hi Board designers, 

Information related to S-parameter models. is provided in the IBIS model and should be used for simulations.

Refer Below:

This information is provided in the IBIS and should be used for simulations.

 Package model is defined on line 88 here in IBIS:

[Package Model]     am62_pkg

|

[Pin]  Signal_name  model_name

F6     ATEST0       NC

AE2    ATEST1       NC

And the definition is on line 168264 here in IBIS:

|   Package Model

|

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

|

[Define Package Model]   am62_pkg

[Manufacturer]           name 1

[OEM]                    name 2

[Description]            329-pin Package

To use these, they have to ensure they check the “Package Parasitics” in the Ctrl IBIS block of the simulation

 This is what it looks like in the simulator we use

IBIS has two package model sections

Pin RLC – references R_pkg, L_pkg, C_pkg from Package  

 The “Pin RLC”   is simply a summary matrix of min/max/typ values across all pins.

 Package Model – references am62p_pkg from bottom of IBIS (different per pin)

The Package Model which contains fully coupled L/C information on a per-pin basis is the accurate one.

 Package RLC should provide a pretty good estimate as they contain fully coupled data.

  
This will be update in the DDR design guide

Additional reference 

(+) [FAQ] Using DDR IBIS Models for AM64x, AM62x, AM62Ax, AM62Px - Processors forum - Processors - TI E2E support forums

 https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1405692/faq-using-ddr-ibis-models-for-am64x-am62x-am62ax-am62px

Note: The description shown above is for AM625. Use IBIS model to find the information based of the selected device.

Regards,

Sreenivasa