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AR# 21461

Virtex-4 IBIS - Virtex-4 IBIS file fails specific versions of ibischk4

Description

The Virtex-4 IBIS file passes ibischk v4.0.0, v4.0.2, and v4.1.1, however, it fails v4.0.1 and v4.1.0 with the following error messages: 

 

"ERROR - Model GTLP: The [Rising Waveform] with [R_fixture]=25 Ohms and [V_fixture_max]=1.65V has MAX column DC endpoints of 0.33V and 1.65v, but an equivalent load applied to the model's I-V tables yields different voltages ( 0.33V and 0.33V), a difference of 1.#J% and 1.#J%, respectively. 

ERROR - Model GTLP: The [Falling Waveform] with [R_fixture]=25 Ohms and [V_fixture_max]=1.65V has MAX column DC endpoints of 0.33V and 1.65v, but an equivalent load applied to the model's I-V tables yields different voltages ( 0.33V and 0.33V), a difference of 1.#J% and 1.#J%, respectively. "

Solution

This appears to be an issue with ibischk, not the GTLP model.  

 

Cadence and Mentor Graphics simulators might flag this error depending on the version of ibischk being employed. However, this should not prevent the tools from reading in the file and using the models for simulation.

AR# 21461
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article