IBIS File Instructions

All Altera IBIS files include package resistance (R), inductance (L), and capacitance (C) data for only one device package. For example, you can only find EP1S25F780 package data in the Stratix IBIS file. For packages of the same device, these values need to be changed. The complete set of package RLC values for a device family can be downloaded at: /content/altera-www/global/en_us/index/support/support-resources/download/board-layout-test/ibis/ibs-ibis_index.html.

Setting Up the Package RLC Values in IBIS

The following example shows how to perform simulations using the resistance, capacitance and inductance data for Stratix EP1S10 484-pin FineLine BGA (EP1S10F484) device package.

The Stratix IBIS file (stratix.ibs) includes package resistance, inductance and capacitance (RLC) information for EP1S25F780 device package. The package RLC values are placed under [Package] keyword of the IBIS file. For other packages of the same device, these values need to be changed. To set up an IBIS file for EP1S10F484 device, perform the following steps:

  1. Download the Stratix IBIS model (stratix_models.xls) and its RLC values package (stratix_rlc.xls) at the http://www.altera.com/support/software/download/ibis/ibs-ibis_index.jsp.
  2. Open the model in a text editor.
  3. Find the values for this device package combination (EP1S10F484) in the stratix_rlc.xls file:

    Resistance typ=0.17Ω min=0.07Ω max=0.33Ω
    Inductance typ=1.95nH min=1.15nH max=3.12nH
    Capacitance typ=0.52pF min=0.29pF max=0.87pF

  4. Substitute these values in the Stratix IBIS model file in the [Package] section (the rest of the sections remain unchanged), as shown in bold below:

    variable typ min max
    R_pkg 0.17 0.07 0.33
    L_pkg 1.95nH 1.15nH 3.12nH
    C_pkg 0.52pF 0.29pF 0.87pF

    [Pin] signal_name model_name R_pin L_pin C_pin

    1 1s_gtl25_io 1s_gtl25_io
    ... ... ...

    [Model] 1s_gtl25_io

  5. Save the model with your changes. The model is now ready to use.

If you have any questions or concerns about the contents of these, please visit Altera's mySupport web site.