Hello, Mithlesh, If you would like to have your model reviewed, you are welcome to send it to the IBIS Model Review Committee (information at http://www.eigroup.org/ibis/support.htm). How much trouble non-monotonicity causes depends on the size of the discontinuity and on the SI tool. Large discontinuities cause more problems for more tools. My personal rule of thumb is - if I can see it clearly on a plot of the table data, it is probably too big. Some possible causes of I-V table discontinuities: separation of clamp and pullup/pulldown data (OK if non-monotonicity goes away when these are added back together), SPICE and measurement tolerances, I/O circuit with internal feedback, incorrect test circuit. Regards, Lynne "IBIS training when you need it, where you need it." Dr. Lynne Green Green Streak Programs http://www.greenstreakprograms.com 425-788-0412 lgreen22@mindspring.com -----Original Message----- From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Mithlesh Shrivas-r64034 Sent: Tuesday, May 23, 2006 5:29 AM To: ibis-users Subject: [IBIS-Users] Non-monotonic data - pullup/down, OUTPUT only model ?? Hello All, I was referring to a old discussions on non-monotonicity and collected information that says these warnings are common for the Pullup and Pulldown tables in I/O. If the IBIS file version is used 4.0 or higher, many these warning could be removed which actually worked for IO. In my case, the pulldown and pullup data are non-monotonic and if i construct an Output type model which does not has Clamp data and therefore, the non-monotonicity will always exist. I'm attaching a section of pulldown/pullup data, please review it. I think after -0.9, the behavior of data is good but problem exist before that. Do you think that initial few non-monotonic data could create any problem? Thanks Mithlesh -- ---" "----------------------------" "--. Mithlesh Shrivas (Core-id:R64034)....... Design Engineer......................... Freescale Semiconductor India Pvt. Ltd.. Express Trade Towers.................... Floor Nos. 5, 6 & 7, Plot# 15 & 16...... Sector- 16A, Noida- 201301 U.P. (India). Mobile: +91-9811824928.................. Office: +91-120-439 (extn) 6149......... ---------------------------------------- ___________________ POPI Classification: =================== [ ] Public [X] Freescale Internal Use Only [ ] Freescale Confidential Proprietary "Analog circuit design is like chess -just because you know how the pieces move doesn't mean you know how to play the game." --PATRICK M. LAHEY "To become expert in analog circuit design, one should have `POWERFUL URGE TO LEARN' and attitude of doing things Properly, Intelligently and Systematically, i.e., Intellectually" -- myself |------------------------------------------------------------------ |For help or to subscribe/unsubscribe, email majordomo@eda.org |with just 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 email a written request to ibis-request@eda.org. | |IBIS reflector archives exist under: | | http://www.eda.org/pub/ibis/email_archive/ Recent | http://www.eda.org/pub/ibis/users_archive/ Recent | http://www.eda.org/pub/ibis/email/ E-mail since 1993Received on Tue May 23 10:42:07 2006
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