[entropy_src/dv] No backpressure on AST RNG agent

The Raw RNG source used by the top-level AST top is expected to not
respect the `ready` output from the `entropy_src`.  This commit modifies
the host/push variant of the `push_pull_driver`, to optionially mimic
such an external device.

This change is helpful in in closing the `main_sm` transition coverage.
The transition StartupHTStart->Idle transition can be blocked if there
is always an RNG sample waiting at the RNG IF, as many parts of the DUT,
including the FSM, wait for the state of the internal FIFOs to
self-clear before fully shutting down.

Signed-off-by: Martin Lueker-Boden <martin.lueker-boden@wdc.com>
Co-authored-by: Andreas Kurth <github@akurth.net>
8 files changed
tree: e1fb3fc787b9f57ede09b8e4349ec8aae7c44488
  1. .github/
  2. ci/
  3. doc/
  4. hw/
  5. quality/
  6. release/
  7. rules/
  8. site/
  9. sw/
  10. third_party/
  11. util/
  12. .bazelignore
  13. .bazelrc
  14. .bazelversion
  15. .clang-format
  16. .dockerignore
  17. .flake8
  18. .gitattributes
  19. .gitignore
  20. .style.yapf
  21. .svlint.toml
  22. .svls.toml
  23. _index.md
  24. apt-requirements.txt
  25. azure-pipelines.yml
  26. bazelisk.sh
  27. BUILD.bazel
  28. check_tool_requirements.core
  29. CLA
  30. COMMITTERS
  31. CONTRIBUTING.md
  32. LICENSE
  33. mypy.ini
  34. python-requirements.txt
  35. README.md
  36. tool_requirements.py
  37. topgen-reg-only.core
  38. topgen.core
  39. WORKSPACE
  40. yum-requirements.txt
README.md

OpenTitan

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About the project

OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.

About this repository

This repository contains hardware, software and utilities written as part of the OpenTitan project. It is structured as monolithic repository, or “monorepo”, where all components live in one repository. It exists to enable collaboration across partners participating in the OpenTitan project.

Documentation

The project contains comprehensive documentation of all IPs and tools. You can access it online at docs.opentitan.org.

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Have a look at CONTRIBUTING and our documentation on project organization and processes for guidelines on how to contribute code to this repository.

Licensing

Unless otherwise noted, everything in this repository is covered by the Apache License, Version 2.0 (see LICENSE for full text).