Formal -- VC Formal FPV study

本文详细介绍了FormalVerification(FPV)的各个方面,包括需求、方法论、输入与输出命令,如分析、验证、设置环境、执行检查,以及覆盖、约束、属性和调试等方面的内容。它还涵盖了在计算农场上运行和调试验证过程的技巧和配置选项。

Introduction to Formal Verification

Requirements

  • Assertion/Cover
  • Assume(Constraint)
  • Synthesizable RTL

Formal Results

  • Proof
  • Falsification
  • Bounded Proof

VC Formal

Flow

Components

FPV

Methodology

Inputs for FPV

Analyze and elaborate commands (example, read_file )

Clock and reset commands (example, create_clock, create_reset )

Execute commands (example, check_fv )

Report commands (example, report_fv )

 Onputs for FPV

Property Status

  • Assertion status: Proven, Falsified, Vacuous(先决条件没有cover到), Witness-Coverable, Uncoverable and Inconclusive(没有得到证明)
  • Assume status: Non-Vacuous, Vacuous(assume无效),Uncoverable and Inconclusive
  • Cover status: Coverable and Uncoverable

Execue FPV

vcf -f run.tcl

vcf -f run.tcl -verdi

 Analyzing Results

report_fv

Property Control

Formal Runtime Control

控制time/memory/engine

  • set_fml_var fml_max_time <time, ex. 24H>
  • set_fml_var fml_progress_time_limit <time, ex. 100M>
  • set_fml_var fml_max_mem <Maximum memory size>

Controlling Engine Effort

  • set_engine [-on|-off] <engine id>
  • set_fml_var fml_effort <effort level, ex. high>

Controlling Resume

  • set_fml_var fml_enable_resume true
  • set_fml_var fml_enable_resume_depth true

Controlling Grid Usage

  • set_grid_usage -type [LSF|SGE|RTDA]=<#_of_workers> ...
  • report_grid_usage

Convergence Improvement

  • snip_driver
  • set_blackbox
  • set_abstractions
  • get_abstractions
  • report_abstraction

sni

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