Transcript Chipset Modeling: Present and Future

4.2 User Defined Measurements
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An alternative to SPICE descriptions
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Measurements created through categories
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Provides flexibility requested by Arpad Muranyi
Provides high abstraction requested by Ian Dodd
Number of categories is the same for all measurements
Specific calculation methods left up to tool
Partial listing of categories (concept)
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Name:
identifier; standard for certain measurements
Type:
event (one-shot), continuous
Location: [Node Declarations], [Pin], etc. pointer
Reference: GND, POWER, External Ref, [Pin], [Node Decl.]
Domain:
Time, Frequency
Volts, Amps, Seconds, Hertz, etc.
Unit:
Duration: Event, (time in seconds)
Value and units; may need load reference
Load:
Relation (?): Placeholder for equation expansion
05/13/04
http://www-fmec.fm.intel.com/sie
*Other brands and names are the property of their respective owners
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4.2 User Defined Measurements
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Tools can require certain names/list contents
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Example: “Overshoot” (name) as voltage (unit) in time
domain (domain) at (location) above (reference)
May need to allow multiple entries
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Advantages
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Highly generic
Can likely be expressed in AMS as well as SPICE
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Example: Load & Load reference three times for PCI
Note that “above” etc. are already VHDL-AMS concepts
SPICE “min” can be developed from abstract equations
Allows expression of required IBIS measurements
Disadvantages
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Resembles current IBIS
May require periodic expansion for new technologies
Unwieldy, not particularly compact
05/13/04
http://www-fmec.fm.intel.com/sie
*Other brands and names are the property of their respective owners
Page 2
Feasibility Requirements
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Acceptable to tools?
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Can data expressed this way be processed by today’s
tools outside of AMS?
Clearly understandable to users?
Categories are complete?
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Need someone to review all SPICE measurement options
to ensure all covered by category listing
Need someone to review all IBIS measurement data for
same…
Apologies to Immanuel Kant…
05/13/04
http://www-fmec.fm.intel.com/sie
*Other brands and names are the property of their respective owners
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