Source III, Inc.

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Source III, Inc.
Vector data translation for Simulation Test

• John Cosley

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VTRAN overview

• Bridging simulation test formats
• Focused on ATPG-generated translations
• Comprehensive processing options
• Large number of canned readers
• STIL, WGL, VCD, TDL_91,
• Numerous formatters for testers EDA
• STIL, WGL, Credence, Teradyne, Agilent, IMS,

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VTRAN Flow
VTRAN
Vector Formats VCD WGL STIL
OVF Original Vector File
TVF Target Vector File
Tools ATPG Simulators
Processing
Verilog/VHDL Testbench STIL WGL
Command File
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VTRANs EDA-IP
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STIL application overview

• Vtrans STIL Reader
• Support for 1450-1999
• Partial (evolving) support for .1 extensions
• User programmable flatten scan or not, flatten
  loops or not, flatten timing or not, pass
  Annotations or not, . . .
• Procedures Macros expanded
• Simplifies translations by providing data access
  rather than just structural access

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STIL application overview

• Vtrans STIL Writer
• 1450-1999 syntax
• Full support for scan Shift and Loops
• User specified Signal groupings for file size and
  performance optimization
• Numerous data processing options available to
  user e.g. signal masking, customized state
  translations, signal name ALIASing,

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Current Status

• STIL reader (1450-1999) in use today in
  conjunction with TetraMAX tested with files
  from Mentor Fastscan and IBM Testbench
• STIL reader .1 support under development
• STIL writer in use today at several customer
  sites
• Limitations
• Some reader syntax not implemented as yet
  InheritWaveform, SubWaveforms, Multi-bit data.

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STIL Technical Issues

• High degree of syntax flexibility (complexity)
  opens the door to unmappable constructs. E.g
  Waveforms, scan Shift blocks,
• Context-sensitive syntax requires more software
  intelligence (processing/time).

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Future STIL plans

• Implement remaining .1 features at least those
  being used by ATPG vendors
• Continue enhancements on Waveform mapping
• Implement InheritWaveform and Multi-bit data
• Continue verification with STIL files from more
  vendors