[ibis-quality] Re: First pass documentation for VT/Ramp/ComponentSection/Model limitations
- From: Barry Katz <bkatz@xxxxxxxxxx>
- To: ibis-quality@xxxxxxxxxxxxx
- Date: Tue, 03 Dec 2002 07:25:48 -0500
Word doc uploaded to web.
Barry
Barry Katz wrote:
>
>
> All,
>
> I have put this in outline form for now. I want to make sure I have all the
> points highlighted prior to formatting into agreed upon template.
>
> Barry
>
>
>
> Component Section
>
> * Level 0
> * Package parasitics
> * Must be defined on a component
>
> * Optional on pins, but if not defined must use NA NA NA
> * Parasitics must be reasonable L <10nF, C <20pF, R <1 ohm
> * External Package model
>
>
> * Physical/Logical/Model Pin Mapping
> * Models must exist in file or refer to Model Selector
> * Pin names should not exceed 20 characters (to change?)
>
> * No Connects represented with NC
>
> * Power pins must be indicated POWER
> * Gnd pins must be indicated GND
> * Special Pins (e.g. analog) to be represented by NC with note
>
> * Diff pin sections
> * If defined, physical pins must exist
> * Vdiff must be defined and reasonable
> * Skew data must be defined and reasonable
>
> * Same models must exist on both pins of a diff pair
>
> * Model Selector
> * All models must be valid
> * First should be default
>
>
>
> * Level 1
> * Package parasitics
> * Package parasitics are validated against data sheet
>
> * Physical/Logical/Model Pin Mapping
> * Mapping is validated to be complete and correct
> * Power, Gnd, NC pins validated
> * All pins defined
>
> * Model Selector
> * First model confirmed to be default
>
>
>
> VT Curves/Ramp Data
>
>
> * Level 0
> * Should have four VT curves
> * 50 Ohm Pullup (Pullup Voltage = Voltage)
> * Rising
> * Falling
>
> * 50 Ohm Pulldown
> * Rising
> * Falling
>
> * Noted Exceptions
> * TBD
>
>
> * VT Curves and Ramp should be consistent
> * VT Curves must be monotonic
>
> * VT Should be consistent with IV curves
> * Ramp data should not be zero
> * No negative ramp values
>
>
>
> * Level 1
> * Ramp should be measured from 20-80% of swing
> * Ramp typ/min/max order verified
> * VT Curves must be visually inspected
> * Should be well behaved with continuous second derivative
> * VT point density should be increased in areas with non-zero second
> derivative
>
> * Excess VT points in beginning and end of VT curves should be removed
>
> * Relative position between all curves should be maintained
> * Final DC value must be achieved
>
>
>
> * Simulations run and confirmed? New section?
>
>
>
> Model Limitations
>
> * Level 0
> * Identification of any known limitations in model
> * Examples include PVT
> * Keywords that may be placeholders(such as Vih/Vih)
> * LVDS restrictions
> * etc
>
>
>
>
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--
Barry Katz
President & CTO
Signal Integrity Software
6 Clock Tower Place, Suite 250
Maynard, MA 01754
Office: 978 461-0449 x19
Cell: 978 618-9078
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