There are a few ways of handling non digital pins in IBIS models. First is to just assign NC to them. Second is to attach a Terminator model to them. These can include power and ground clamps or even input/output impedance. This allows the SI simulator to at least include the analog net in crosstalk simulations. Third is to provide an IBIS model for selected pin types. For example the output of a DAC can be modeled as a digital output if you assume full swing 0000 to FFFF transitions in the DAC output. This allows the SI simulator to do some work on the analog pins. Opamps and also be modeled with way with full scale output swings. Forth is to provide a SPICE model. The selection is left to the model maker. Tom Dagostino Teraspeed(R) Labs 13610 SW Harness Lane Beaverton, OR 97008 503-430-1065 503-430-1285 FAX tom@teraspeed.com www.teraspeed.com Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 401-284-1827 -----Original Message----- From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Raghavendra M Sent: Monday, July 13, 2009 7:21 PM To: ibis-users@server.eda.org Subject: [IBIS-Users] Analog signal pin Hi, I have an analog pin like analog output of DAC or Vcontrol pin of the PLL. How should i model this an analog pin. Does ibis specify a standard to model an analog pin? How should i specify about this pin in ibis file? Regards Raghavendra -- 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 1993 -- 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 Jul 13 21:04:36 2009
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