====================================================================== IBIS FUTURES/COOKBOOK SUBCOMMITTEE MEETING MINUTES Date: September 22, 2005 Attendees: ---------- Cadence Design Systems - *Lance Wang Cisco - *Syed Huq, *Zhiping Yang Intel - *Michael Mirmak Mentor Graphics - *John Angulo, *Ian Dodd Micron - *Randy Wolff NCSU - *Ambrish Varma Teraspeed - *Bob Ross ====================================================================== Next Meeting: Thursday, September 29, 2005 9 AM - 10 AM US Pacific Time Telephone Bridge Passcode 916-356-2663 3 952-0260 Agenda: 9 - 9:05 AM Opens 9:05 - 10 AM BIRD95 Discussion - Follow up on parasitics experiments (The meeting will only last one hour unless an extended discussion is requested) ======================================================================== FUTURES --------- Lance Wang and Michael Mirmak apologized for not having additional information available on recent BIRD95 research. Lance reiterated his and Zhiping Yang's suggestion that IBIS and transistor-based models show different currents; they are assessing the impacts. Zhiping will be sending the Cisco database for Cadence to check; it will be available early next week at the latest. Lance also noted that the previous work is based on the assumption of node-based calculations in tools; current summations will not be equal to zero at all nodes if charge storage effects exist. Lance expressed concern that Michael's C_comp splitting conclusions have direct impact on C_comp. Also, he would like to be assured that treatment of ground parasitics is not "making a difference" in how analysis results turn out. Michael will complete his checking of Zhiping's sample circuits and report back. Zhiping suggests that the B-element algorithm and concept may need improvement. Also, compensation circuits added to base IBIS element may be different in different tools, depending on the specific implementation. Lance commented that most tools' basic IBIS algorithms are the same; Zhiping countered that Sigrity's treatment, for example, may be different than most. Ian Dodd observed IBIS specifies steady-state well, plus V-t tables, but it doesn't specify anything about dynamic behavior, particularly for non-resistive loads. We interpolate the behavior between two of four V-t tables. Michael echoed this point, stating that Arpad had pointed out the inapplicability of the two-equations, two-unknowns IBIS algorithm to reactive loads Michael concluded the BIRD95 discussion by outlining the requirements for an Oct. 7 vote on BIRD95. Bob made a number of statements on BIRD100. Michael encouraged anyone with concerns or questions to contact him offline, in preparation for extended discussion in an upcoming Futures meeting. ARs ----- John Angulo - analyze BIRD100 proposals, after Mentor discussion Sam Chitwood - analyze BIRD100 proposals, after Sigrity discussion Lance Wang - analyze BIRD100 proposals, after Cadence discussion