Method and apparatus for test generation during circuit design

Abstract

A method and apparatus are provided for functionally verifying an integrated circuit design. A hardware-oriented verification-specific object-oriented programming language is used to construct and customize verification tests. The language is extensible, and shaped to provide elements for stimulating and observing hardware device models. The invention is platform and simulator-independent, and is adapted for integration with Verilog, VHDL, and C functions. A modular system environment ensures interaction with any simulator through a unified system interface that supports multiple external types. A test generator module automatically creates verification tests from a functional description. A test suite can include any combination of statically and dynamically-generated tests. Directed generation constrains generated tests to specific functionalities. Test parameters are varied at any point during generation and random stability is supported. A checking module can perform any combination of static and dynamic checks. Incremental testing permits gradual development of test suites throughout the design development process. Customized reports of functional coverage statistics and cross coverage reports can be generated. A graphical user interface facilitates the debugging process. High-Level Verification Automation facilities, such as the ability to split and layer architecture and test files, are supported. Both verification environments and test suites can be reused.