Subject: RE: [IBIS-Users] FW: Questions on numbers in IBIS
From: Lynne Green (lgreen22@mindspring.com)
Date: Tue Mar 02 2004 - 09:29:01 PST
Actually, it is even better than that. Many tools check just the first
letter to see if it is a scaling prefix, and ignore anything else. So
valid voltages would include 3.0, 3.0V, 3.0sec, 3.0ohms, etc.
Since the units are not required, many IBIS files leave the units out.
Best regards,
Lynne Green
-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Angulo, John
Sent: Monday, March 01, 2004 11:46 AM
To: 'ibis-users@eda.org'
Subject: [IBIS-Users] FW: Questions on numbers in IBIS
The following is posted on behalf of Shawn Silverman at Quantic EMC, and Roy
Leventhal. Please send any private replies to shawn@quantic-emc.com and
Roy.Leventhal@ieee.org.
--------------------
From: Shawn Silverman [mailto:shawn@quantic-emc.com]
Sent: Thursday, February 26, 2004 4:18 PM
To: Roy Leventhal
Subject: Questions on numbers in IBIS
Hello, Roy. I have some confusion regarding numbers in an IBIS file. It
states in section 3.8 that numbers with a suffix are meant to be interpreted
as a number followed by any number of letters, where the first letter gives
the actual scaling. For example, 3.0mOhms means 3.0e-3.
Now, there are several uses with voltages and resistances where this rule
has some exceptions. I can specify 3.0V for voltage and 3.0ohm for ohms.
Doesn't this violate the rules and therefore incorrect? Should I make a
special case for "V" and "ohm" as a suffix when I parse numbers and ignore
them? What happens if there is a unit with the same starting letter as a
valid scaling suffix. Eg. 'f' as in 3.0farad?
Thanks!
-Shawn
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