High-level architectural description for Open Modeling Coalition reference implementation of standardized Open Library Accessibility API with interface to OpenAccess design database.

1. Opening Library Access through a
Standard Data Interface
Architecture
Timothy J. Ehrler H. John Beatty
OMC Vice-chair OMC Chair
Philips Semiconductors IBM Corp.
tim.ehrler@philips.com jbeatty@us.ibm.com

2. Introduction
• The OpenAccess Coalition (OAC) has had a long-standing, and now
high-priority, roadmap item necessary for library model access
– implement APIs and data structures
• static (popular format) & dynamic (algorithmic) analysis methods
– provide timing, power, and signal integrity modeling
– provide functional information for synthesis, simulation, test, model
analysis, and state-dependant evaluations
– enable model analysis and annotation
• The Open Modeling Coalition (OMC) was chartered to respond to the
recommendations of the Design Technology Council (DTC) Library
Task Force concerning industry-wide characterization and modeling
issues
– accuracy
– consistency
– data & algorithm transparency
– standard application & tool access methods
Open Library Access through a Standard Data Interface Architecture
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3. Coalition Working Relationships
• OpenAccess Coalition (OAC) chartered to address & manage design
database issues & maintenance
– OAC is a donation model
• Seed technology was donated to the OAC
• Changes to the standard made by others are given back to the OAC
• Open Modeling Coalition (OMC) chartered to address library modeling &
characterization issues
– OMC is a license model
• Seed technology is licensed to the OMC under Reasonable and Non-Discriminatory
terms (RAND)
– Owner retains ownership of contributed material
• Improvements are licensed back (RAND)
• Each coalition to have working group to address library modeling & analysis
issues appropriate to their respective objectives
– OAC Library Working Group (LWG)
– OMC Data Model Working Group (DMWG)
• Oversight & coordinating work group to be established to ensure compatible
development & implementation
– Include members of each coalition work group
– Satisfy the requirements and obligations of both groups
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4. Proposed Joint Library Working Group
• Single work group comprising members of both coalitions under SI2
– Less overhead among work group members
– Fewer duplicated or conflicting efforts
• Appropriate partitioning & allocation of development & implementation roles
& responsibilities
– OMC members responsible for C interface (IEEE-1481)
• OA compatible data structures & APIs
• Interface with OA for callbacks
– OAC members responsible for C++ interface (OA)
• Plug-in methodology & architecture ala Design Management (DM)
• Analysis annotation & access API definition
– Continuous validation with respective coalition change/steering groups
• Integration & verification integral part of objectives
– Not separate process or activity
– Continuous communication achieves objectives much more effectively than inter-
coalition work group “packet” communication and problem / conflict resolution
• Precluding differences and avoiding conflicts preferable to
[perhaps] disjoint interface / integration efforts
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5. OMC Architecture Deliverables
• Static Format Characterization
– Controlled revisions to the Subsystem
ECSM format.
Extended OA interface
– ECSM-CMG established to Modeling
oversee the improvements Subsystem
• Dynamic format
– Reference platform built DESIGN DATA Compiler ECSM
around OAC and IEEE-1481
Data Model (DM)
• Consistent application access to
library data and algorithms
Application
1
Application
2
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6. OMC High-Level Architecture
INPUT Process Technology, Test
Site, Design
OA/OMC and Simulation Information
Interface
SNPS/Magma
Characterization
FE OMC
DESIGN DATA POPULAR
FORMATS (.lib,
Data Model (DM) *1 OMC Raw SPDM, CSM,
DM API PLUG-IN C++
ECSM, other)
C-based Library API
1 Generator
IBM IBM
IP Model
Generator Generator
DESIGN IBM
TOOLS
Application1 Compilation
System
Application2 OMC
Applicationn
IEEE Popular
MAGMA 1481 Format
SDF Library Bridge
OA Gear Generator
Tools using
Popular
Format
Libraries
licensed
technology
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7. OpenAccess Library Interface Plug-In
• Application currently interfaces with • Application need only interface with
design database and library design database
– Application responsible for library – Library communications transparent
communications to application
– Application must handle full set of – Library interface plug-in handles full
external & callback functions set of external & callback functions
– Complex application interface to – Application relieved of library-specific
library required interface issues
Application
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