Hi, Chris, Just for the info. You can use Spice Macromodeling to convert IBIS new SSO models easily. So, we don't have to wait for the simulation tool enhancement. We have done few cases for some system companies using this feature/technology (IBIS BIRD 98/95). And results are pretty good. Yes, I personally did not see any chip vendors giving out any IBIS SSO model yet. However, we are ready for making and using them. Regards, Lance Wang 978-764-2298 IO Methodology Inc. (www.iometh.com) A High-Speed Design Utility Tool and Service Provider Meet us in DesignCon 2009, Booth 925. -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Chris Cheng Sent: Tuesday, January 13, 2009 5:50 PM To: David Lieby; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Where are IBIS models with SSO support ? Can a behavioral model predict SSO impact? Yes, BTDT over ten years ago. Can an IBIS 2.x I-V curve be somehow hacked to model SSO? No, BTDT and proved it can not. Hence there is 4.x model. -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of David Lieby Sent: Tuesday, January 13, 2009 2:27 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Where are IBIS models with SSO support ? Several years ago I saw a paper by someone (I have forgotten the name of the author) that detailed the use of IBIS files in HSPICE to get an idea of SSO in a system. The system is set up to use the current output and timing from the IBIS file, along with some extrapolation for cross current, to get a result of the current usage of a switching output. Then several of them are fed from a power bus with a feed that is set up to look like several adjacent power/ground connections to the board. Yes, there are a lot of people who are taken aback by this approach. On the other hand, once you go through the exercise and calibrate the results across at least one existing system (lab measurements, ghastly), you have something that is within 10 percent of what you really will see when the system is built. It does take time and no one else will do the work or figure out what you really want. I kept a whole group of hardware engineers happy with this approach and the results with real systems. Cheers, dav0 David Lieby Confidentiality Notice. This message may contain information that is confidential or otherwise protected from disclosure. If you are not the intended recipient, you are hereby notified that any use, disclosure, dissemination, distribution, or copying of this message, or any attachments, is strictly prohibited. If you have received this message in error, please advise the sender by reply e-mail, and delete the message and any attachments. 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