One of our development groups is currently reviewing one of our new IBIS models for LEVEL 0 compliance prior to initial issue to customers. A question has come up regarding the interpretation of section 4.4.2 in the iq_specification.txt document (IBIS QUALITY SPECIFICATION - Revision 1.0). While the text of the document defines the intent very precisely, can someone please provide an interpretation of what really needs to be checked? Initially the group thought it was as simple as verifying that the voltages at the endoints of the V-T table were within 2% of the endpoint voltages in the I-V tables, but after re-reading section 4.4.2 we are not convinced that is a correct interpretation. 4.4.2 {LEVEL 0} V-T table endpoints consistent with I-V tables The voltage associated with the intersection of the V_fixture, R_fixture, and R_dut (if present) load line with the respective combined high/low DC I-V characteristic should be within 2% of the V-T table DC endpoints based on the V-T table DC range. The combined High State DC I-V characteristic is defined as the sum of the [Power Clamp], [GND Clamp], and [Pullup] I-V tables (ground relative). Similarly, the combined Low State DC I-V characteristic is defined as the sum of the [Power Clamp], [GND clamp], and [Pulldown] I-V tables (ground relative). -Ray Anderson Raymond Anderson Senior Signal Integrity Staff Engineer Product Technology Department Advanced Package R&D Xilinx Inc. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org |with the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or e-mail a request to ibis-request@eda-stds.org. | |IBIS reflector archives exist under: | | http://www.eda-stds.org/pub/ibis/email_archive/ Recent | http://www.eda-stds.org/pub/ibis/users_archive/ Recent | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993Received on Mon Sep 11 12:19:46 2006
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