It means, simply, that the quantity (V+ - V-) must be greater than 250 mV, in order to insure that the input has switched 'high', and less than -250 mV, in order to insure that it has switched 'low'. -db ________________________________ From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Nittmann, Johann Sent: Thursday, February 26, 2009 8:56 AM To: ibis-users@server.eda.org Subject: [IBIS-Users] How is Vdiff defined ? Does Vdiff=250mV mean +- 125mV or +-250mV? Dear all, Could somebody explain how the value of Vdiff is defined? Does Vdiff=250mV mean +-125mV or +-250mV! According the IBIS cookbook-v4, at page 73 where it says "For example, an active-high buffer with a vdiff of 100 mV will be considered high if the non-inverting pin is at least 100 mV above the inverting pin. " I would expect it to be defined as +-125mV but one our SI tool provider is defining it at +-250mV? Thanks, Johann Johann Nittmann Principal Engineer Cavium Networks 100 Nickerson Road Marlborough, MA 01752 Tel: 508 683 8869 -- This message has been scanned for viruses and dangerous content by MailScanner <http://www.mailscanner.info/> , and is believed to be clean. This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately. -- 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 Thu Feb 26 10:08:57 2009
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