Hi Vipul, I will try to explain with an example Say, I/O supply (DVDD) is 3.3V Rising Vth+ Vinl+ = 1.2 Vinh+ = 2.0 Falling Vth- Vinl- = 0.8 Vinh+ = 1.6 Now - simulator will have three level = 0(low) 0.5(ambiguous) 1(high) While rising 0 - > 3.3v 0 - 1.2(vinl+) => 0 1.2(Vinl+) - 2.0 (Vinh+) => 0.5 (ambiguous) 2.0(Vinh+) and above => 1 While falling 3.3V -> 0 3.3V - 1.6V (Vinh+) => 1 1.6V(Vinh+) - 0.8V (Vinl-) => 0.5 (ambiguous) 0.8V and below => 0 This promises that say a signal has switched low-to-high ie.., crossed (2.0), it will remain in high state even if signal oscillate or find a kink( 0 - 2.0V - 1.65V - 3.3V), but not below 1.6V. For more information please refer to, http://www.vhdl.org/pub/ibis/birds/bird39.txt Thanks, Muniswar -----Original Message----- From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Vipul Pursottam PATEL Sent: Thursday, September 04, 2008 1:52 PM To: ibis-users@eda.org Subject: [IBIS-Users] Regarding the Understanding of Vinl+/- & Vinh+/- sub-params Hello Experts, I have a query regarding the explaination given for "Vinh+/-" & "Vinl+/-" sub-params of [Model Spec] Keyword given in IBIS specifications. According to IBIS specifications, "Vinh+/-" & "Vinl+/-" can be used to Model the Rising Edge Switching region and Falling Edge Switching regions respectively for recievers with hysteresis. These sub-params specifies the regions where the thresholds for low-to-high & high-to-low transitions should appear. I am not able to understand how the Simulation tools (should) interpret/use this information while simulating for a rising or falling input (to a reciever with hyst.), for a particular Voltage & process. Which keyword specifies the high-to-low and low-to-high transition thresholds in case of reciever with Hysteresis? Also, how the transition at the recievers output look like, should it be a abrupt level switching on threshold crossing or something else? Regards, Vipul -- 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 Thu Sep 4 03:31:53 2008
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