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Introduction to
Verification of VLSI
Design
and
Functional Verification
1
Dr
Usha
Mehta
04-08-2021
Usha Mehta,
Ph.D. in Testing and Verification of VLSI Design
usha.mehta@ieee.org
usha.mehta@nirmauni.ac.in
Acknowledgement…..
This presentation has been summarized from various
books, papers, websites and presentations on VLSI
Design and its various topics all over the world. I
couldn’t item-wise mention from where these large
pull of hints and work come. However, I’d like to
thank all professors and scientists who created such
a good work on this emerging field. Without those
efforts in this very emerging technology, these notes
and slides can’t be finished.
2
Dr
Usha
Mehta
04-08-2021
3
Dr
Usha
Mehta
04-08-2021
4
Dr
Usha
Mehta
04-08-2021
5
Dr
Usha
Mehta
04-08-2021
System Design Flow
6
Dr
Usha
Mehta
04-08-2021
Design Flow
7
Dr
Usha
Mehta
04-08-2021
VLSI Design Flow
8
Dr
Usha
Mehta
04-08-2021
Source of Errors
• Errors in Specification
• Unspecified Functionality
• Conflicting requirements
• Unrealized features
• No model for checking as it is at top of
abstraction hierarchy
• Errors in Implementation
• human error in interpreting design functionality
9
Dr
Usha
Mehta
04-08-2021
How to reduce human
introduced errors in
interpretation?
• Automation
• Poka-Yoke
10
Dr
Usha
Mehta
04-08-2021
• Automation
• The obvious way to reduce human
introduced error
• It is not always possible specially when the
processes are not well defined and requires a
human ingenuity and creativity.
• Poka-Yoke
• A Japanese term that means "mistake-
proofing" or “inadvertent error prevention”
• Towards the fool automation but not
complete automation
• Human intervention is needed only to decide
on the particular sequence or steps required
to obtain the desired results.
• Verification now a days remains an art.
11
Dr
Usha
Mehta
04-08-2021
Redundancy
• Most costly but highly efficient approach
• Most widely used for ASICs
12
Dr
Usha
Mehta
04-08-2021
Reconvergence Model
It consists the following steps:
1. Creating the design at a higher level of abstraction
2. Verifying the design at that level of abstraction
3. Translating the design to a lower level of abstraction
4. Verifying the consistency between steps 1 and 3
5. Steps 2, 3, and 4 are repeated until tapeout
The transformation can be any process like
:
• RTL coding from specification
• Insertion of a scan chain
• Synthesizing a RTL code into gate level netlist
• Synthesizing a gate level netlist in to lay out …..
13
Dr
Usha
Mehta
04-08-2021
Do you recall?
14
Dr
Usha
Mehta
04-08-2021
Verification Methods
• Functional Verification
• Formal Verification
• Equivalence Checking
• Model Checking
• Semiformal Verification
• Assertion Based Methods
15
Dr
Usha
Mehta
04-08-2021
Verification Techniques
• Simulation (functional and timing)
• Behavioral
• RTL
• Gate-level (pre-layout and post-layout)
• Switch-level
• Transistor-level
• Formal Verification (functional)
• Binary Decision Diagrams
• Equivalence Checking
• Model Checking
• Static Timing Analysis (timing)
16
Dr
Usha
Mehta
04-08-2021
Thanks……

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Verification flow and_planning_vlsi_design

  • 1. Introduction to Verification of VLSI Design and Functional Verification 1 Dr Usha Mehta 04-08-2021 Usha Mehta, Ph.D. in Testing and Verification of VLSI Design usha.mehta@ieee.org usha.mehta@nirmauni.ac.in
  • 2. Acknowledgement….. This presentation has been summarized from various books, papers, websites and presentations on VLSI Design and its various topics all over the world. I couldn’t item-wise mention from where these large pull of hints and work come. However, I’d like to thank all professors and scientists who created such a good work on this emerging field. Without those efforts in this very emerging technology, these notes and slides can’t be finished. 2 Dr Usha Mehta 04-08-2021
  • 9. Source of Errors • Errors in Specification • Unspecified Functionality • Conflicting requirements • Unrealized features • No model for checking as it is at top of abstraction hierarchy • Errors in Implementation • human error in interpreting design functionality 9 Dr Usha Mehta 04-08-2021
  • 10. How to reduce human introduced errors in interpretation? • Automation • Poka-Yoke 10 Dr Usha Mehta 04-08-2021
  • 11. • Automation • The obvious way to reduce human introduced error • It is not always possible specially when the processes are not well defined and requires a human ingenuity and creativity. • Poka-Yoke • A Japanese term that means "mistake- proofing" or “inadvertent error prevention” • Towards the fool automation but not complete automation • Human intervention is needed only to decide on the particular sequence or steps required to obtain the desired results. • Verification now a days remains an art. 11 Dr Usha Mehta 04-08-2021
  • 12. Redundancy • Most costly but highly efficient approach • Most widely used for ASICs 12 Dr Usha Mehta 04-08-2021
  • 13. Reconvergence Model It consists the following steps: 1. Creating the design at a higher level of abstraction 2. Verifying the design at that level of abstraction 3. Translating the design to a lower level of abstraction 4. Verifying the consistency between steps 1 and 3 5. Steps 2, 3, and 4 are repeated until tapeout The transformation can be any process like : • RTL coding from specification • Insertion of a scan chain • Synthesizing a RTL code into gate level netlist • Synthesizing a gate level netlist in to lay out ….. 13 Dr Usha Mehta 04-08-2021
  • 15. Verification Methods • Functional Verification • Formal Verification • Equivalence Checking • Model Checking • Semiformal Verification • Assertion Based Methods 15 Dr Usha Mehta 04-08-2021
  • 16. Verification Techniques • Simulation (functional and timing) • Behavioral • RTL • Gate-level (pre-layout and post-layout) • Switch-level • Transistor-level • Formal Verification (functional) • Binary Decision Diagrams • Equivalence Checking • Model Checking • Static Timing Analysis (timing) 16 Dr Usha Mehta 04-08-2021
  • 17.