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Understanding the IBIS Model
i.MX53 System Development User’s Guide, Rev. 1
Freescale Semiconductor 3-7
3.5 Model Golden Waveforms
Golden waveforms are a set of waveforms simulated using known ideal test loads. They are useful for
verifying the accuracy of behavioral simulation results against the transistor level circuit model from
which the IBIS model parameters originated.
Figure 3-3 shows a generic test load network.
Figure 3-3. Generic Test Load Network
Table 3-4 explains the golden waveform keywords.
3.6 Naming Conventions for Model Names and Usage in i.MX53 IBIS
File
The model names are defined per each [Model selector]. The models may differ from each other by having
different parameters—such as voltage, drive strength, mode of operation, and slew rate. The mode of
operation, drive strength, and slew rate parameters are programmable by software (see Section 3.6.1,
“[Model Selector] ddr,”–Section 3.6.5, “List of Pins Not Modeled in the i.MX53 IBIS File,” for further
details).
Table 3-4. Golden Waveform Keywords
Keyword Required Comment
[Test Data] No • Provides a set of golden waveforms and references the conditions under which they
were derived.
• Useful for verifying the accuracy of behavioral simulation results against the
transistor level circuit model from which the IBIS model parameters originated.
[Test Load] Yes • Defines a test load network and its associated electrical parameters for reference
by golden waveforms under the [Test Data] keyword.
• If Test_load_type is Differential, the test load is a pair of the above circuits. If the
R_diff_near or R_diff_far subparameter is used, a resistor is connected between
the near or far nodes of the two circuits.
• If Test_load_type is Single_ended, R_diff_near and R_diff_far are ignored.