RE: [IBIS-Users] Rising falling waveform timestep

Anshul,
 
HyperLynx's IBIS editor doesn't give you errors
because it is perfectly legal to have non-uniformly
distributed points in the I-V and/or V-t tables.
 
Arpad
=====================================================

________________________________

From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Anshul Bansal
Sent: Monday, October 27, 2008 10:52 AM
To: al davis
Cc: ibis-users@server.eda.org
Subject: Re: [IBIS-Users] Rising falling waveform timestep


Hello Al,

Thanks for replying to my question. I think I understand that I can use unequal timsteps to get better accuracy of the waveforms. 

Hyperlynx is the editor that I am using to check the Syntax of the final IBIS file. I was just emphasizing the point that I get no syntax error when using unequal timesteps.

Thanks,

Anshul

al davis wrote: 

	On Monday 27 October 2008, Anshul Bansal wrote:
	  

		I had a question regarding the timesteps for the
		rising/falling waveform. Is it legal to use unequal timestep
		for the rising or falling waveforms? 
		    

	
	The use of unequal timestep is preferred.  You should use more 
	points where they are needed to express detail and less points 
	in relatively flat sections.
	
	It actually makes a difference.  If your data looks like steps, 
	with groups of consecutive values that are the same, you are 
	using too many steps.  It does matter.
	
	You may not see a problem because files like that are common so 
	simulators will drop steps to make the waveform smooth and 
	simulateable.
	
	  

		I did not read anywhere 
		in the IBIS spec that prevents me from doing so. Even
		Hyperlynx is able to read the IBIS file with unequal timestep
		and does not give any warnings/errors.
		    

	
	What do you mean "even Hyperlynx" ????????
	
	  


-- 
This message has been scanned for viruses and 
dangerous content by MailScanner <http://www.mailscanner.info/> , and is 
believed to be clean. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo_ f rom _eda-stds.org |with the appropriate command message(s) in the body: | | help | subscribe ibis | subscribe ibis-users | unsubscribe ibis | unsubscribe ibis-users | |or e-mail a request to ibis-request_ f rom _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 1993