I was told that quoting from the Cookbook as a graphic image didn't make it through the email reflector, so I am resending my message with a textual quote of that section. Thanks, Arpad ======================================================= > _____________________________________________ > From: Muranyi, Arpad > Sent: Monday, January 08, 2007 11:24 AM > To: ibis@eda.org > Subject: A slight spec/cookbook discrepancy > > Happy New Year everyone! > > I just noticed a slight discrepancy between the > IBIS specification and the IBIS Cookbook. Under > the differential pin section the IBIS specification > says the following: > > | The fourth, fifth, and > | sixth columns, tdelay_typ, tdelay_min, and tdelay_max, > | contain launch delays of the non-inverting pins relative to > | the inverting pins. All of the numerical entries may be a > | positive, zero, or negative number. > > The IBIS Cookbook, on the other hand, says this on pg. 73: > > The IBIS section shown above would appear shortly after the pin list in an IBIS file. The keyword requires six parameters: the pin names to be treated differentially (the non-inverted pin is always named first); the differential threshold voltage if the buffer is capable of receiving signals; and three time delays, expressing the launch delays of the inverting pin in relation to the non-inverting pin when the buffer drives (such delays would be visible as skew, jitter and/or varying crossover voltages between the signals). > Which is correct? I personally would prefer what the > cookbook says, because I usually think of the non-inverting > output as the "original", "unmodified", i.e. the reference. > However, it may be easier to change the cookbook than the > spec... > > Thanks, > > Arpad > ============================================================= -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -------------------------------------------------------------------- |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 Jan 8 12:58:41 2007
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