If all else fails, read the spec... |======================================================================= ====== | | Section 9 | | N O T E S O N D A T A D E R I V A T I O N M E T H O D | |======================================================================= ====== ... ... ... | The "min" and "max" columns for all remaining keywords and subparameters | will contain the smallest and largest magnitude values. This applies to the | [Model] subparameter C_comp as well even if the correlation to the voltage, | temperature, and process variations are known because information about such | correlation is not available in all cases. Arpad |======================================================================= ====== ________________________________ From: owner-ibis@eda.org [mailto:owner-ibis@eda.org] On Behalf Of Ummalaneni, Venu Babu (Venu) Sent: Wednesday, April 27, 2005 4:32 AM To: ibis-users; ibis Subject: [IBIS] Filling C_comp value in IBIS file Hi All, I hope that for filling the typ, min and max column data under V-I and V-t tables, PVT conditions are defined for each column. [Approach 1] But for filling the data under the [C_comp] keyword these PVT conditions are not defined. We are taking worst case fast process corner, maximum voltage and minimum temperature values for filling [C_comp] min column. And reverse for max column. By following above procedure for some buffers we are not getting C_comp values as per desirable sequence C_Comp(min) < C_comp(typ) < C_Comp(max). And hence we are getting warning message from the golden parser. Recently, I read following para from Cook book: [Approach 2] The C_comp parameter specifies the buffers input, output or I/O capacitance and can have a typical, minimum and maximum value. Note that when constructing the IBIS file the numerically largest value of C_comp is listed as the 'max' value while the numerically smallest value of C_comp is listed as the 'min' value. C_Comp min and max values do not necessarily correlate with the min and max conditions under which the I/V and switching data was gathered. Which one need to follow? Approach 1 or Approach 2? Thanks in advance. Best Regards, Venu. |------------------------------------------------------------------ |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 Wed Apr 27 08:38:33 2005
This archive was generated by hypermail 2.1.8 : Wed Apr 27 2005 - 08:40:54 PDT