Bear in mind that model names in an IBIS file are case-sensitive. The value must be one of the listed types from the IBIS specification. Valid combinations of Vref, Rref, Cref, and Vmeas should be as follows: No capacitors or inductors, for example. Quality level 1 IQ Buffer pdisv: The Curve Overlay Metric only applies in cases where the two curves should theoretically lie on top of one another. Verify that if [Power Clamp] exists there is no clamp current behavior in the negative portion of the [Pullup] table.
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Exceptions to this should be explained in a comment. If ibisckh file contains only one component, the component and file quality are synonymous, so only the component quality level needs to be indicated.
IBISCHK Parser Issue Reports (BUGs)
The expected currents should be less than 1 uA in the ibiscbk operating ranges typically from 0 to 2 Vcc range in the table.
Document the method used to embed the termination into the clamps. Curve viewing tools may offer the ability to translate Vcc-relative tables so that the curves viewed are ground-relative. The term "curve" refers to the visual plotting ibisch, table data. Typ should pass through 3. Final DC value must be achieved, ie.
Some checks are more easily performed visually.
The Curve Overlay Metric only applies in cases where the two curves should theoretically lie ibidchk top of one another.
The Golden IBIS parser also stops reporting errors on a table after the first non-monotonic points are found. The other two correlation levels apply to both types of correlation. This will be the minimum of the quality levels of the buffers used by the component. Therefore, the Curve Envelope Metric is the only valid metric in this case. Skew data must be reasonable if defined. Ibischi does the circuit work" What circuit elements are necessary and sufficient to model the behavior of the circuit" What test loads might stress the accuracy of the behavioral model" How will the circuit be used" Take the time to answer these questions before beginning the exercise.
Skew data can be NA. Enough detail should be present to enable the semiconductor vendor to trace back to the original source of the model ibiscjk at a later date, for example: It is assumed for ramp that the 50 ohms is present iischk for both edges it goes to VCC. Bear this in mind when checking Vcc-relative tables.
For IBIS buffer [Model] libraries, it is recommended that one pin be used for every model and that the pin name be the ibischkk as the model name. Typ temperature is usually higher than room temperature. Correlation Level 3 insures the highest degree of accuracy as well as confidence that the semiconductor vendor can indeed control the process in a manner consistent with the model data.
At least one additional point should be included that prevents the slope from being 0. For example for a 3.
[ibis-quality] ibischk - ibis-quality - FreeLists
No capacitors or inductors, for example. Another example is the measurement of a known-typical sample component and a structural simulation of the same network under identical process-voltage-temperature conditions. This approach effectively decouples the behavioral simulator from the hardware and splits the correlation problem into independent components.
Correlation Level 2 is relevant to correlation of golden waveforms to lab measurements and behavioral simulations. Ideally, there should be no warnings, but it is recognized that some warnings cannot be eliminated. Exceptions can exist for older TTL technologies where several milliamps may be observed and for some ECL and other technologies with which can have internal termination networks.
Or use a viewer which can combine the two clamp tables into one. These apply only if the waveforms were generated by simulation. Tue, 12 Apr At a minimum, this section should identify: If these curves are viewed graphically, ground relative, they should pass through their respective supply rail eg.
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