Hi Arpad, many thanks for answer! I would say that IBIS specs are not 100% clear on that place, because for input buffers there should not be any connection required, because it has only power and ground clamps. Perhaps for next IBIS version in specs could be written one example for input buffer so questions like this my could be avoided. Many thanks, Radovan -----Original Message----- From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Muranyi, Arpad Sent: Friday, November 18, 2005 9:37 PM To: ibis-users@eda.org Subject: RE: [IBIS-Users] [Pin Mapping] for input models Radovan, The IBIS specification says that you should use NC. | Each line must contain either three, five or six entries. | Use the reserved word NC where an entry is required but a bus | connection is not made (see below). NC for the pulldown and pullup references doesn't mean that the buffer model has them, you just are not connecting them. It means that you are not making a connection to those rails for whatever reason, which in your case is that they don't exist for your input model. Arpad =============================================== -----Original Message----- From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Radovan.Vuletic@infineon.com Sent: Friday, November 18, 2005 7:42 AM To: ibis-users@eda.org Subject: [IBIS-Users] [Pin Mapping] for input models Hi IBIS experts, I have a question considering using [Pin Mapping] for input models. Question would be: how many entries should be for input buffer in for [Pin Mapping] keyword? Specification says: "Each line must contain either three, five or six entries." (Btw., in specification there is no example for input buffer) Format of command is: [Pin Mapping] pulldown_ref pullup_ref gnd_clamp_ref power_clamp_ref ext_ref So if I write for example: A1 GND VCC There are only 3 entries, but according to format specification second and third entry are used for pulldown reference and pullup reference respective, what is a nonsense in this case, because input buffers have only power and ground clamps and no pull-up and pull down references. If I write something like: A1 NC NC GND VCC This according to my opinion makes more sense, but still I have to use NC for pull-up and pull down references. What I was able to find as an example on Internet had always 5 entries, like: A1 GND VCC GND VCC For me this is senseless, because, as said before, one input buffer has only power and ground clamps. So, can somebody write me what is a proper format for input buffer in [Pin Mapping] ? Thanks, Radovan Best regards / Mit freundlichen Gru?en / S postovanjem Radovan Vuletic Infineon Technologies AG MP PD PDE Room 03.911 Balanstra?e 73 D-81541 Munchen Phone: +49 (0)89 234 20108 Fax: +49 (0)89 234 27705 Fax (PC): +49 (0)89 234 955 5305 E-mail: radovan.vuletic@infineon.com |------------------------------------------------------------------ |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 1993 |------------------------------------------------------------------ |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 1993 |------------------------------------------------------------------ |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 Mon Nov 21 00:17:46 2005
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