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Automated Verification in HW/SW Co-design
Charvát, Lukáš ; Kubátová, Hana (oponent) ; Řehák, Vojtěch (oponent) ; Vojnar, Tomáš (vedoucí práce)
The subject of the thesis is to design new hardware verification techniques optimized for a process of HW/SW co-design in which hardware and software are developed in parallel to speed up the development of new embedded systems. Currently, microprocessor co-design tools typically allow to verify designs by simulation and/or functional verification. However, even extensive functional verification can miss some non-trivial bugs. Therefore, formal verification has become more and more desirable in recent years. As opposed to testing and bug-hunting techniques that only aim at detecting flaws, the goal of formal verification is to rigorously prove that the system is indeed correct. Formal verification is, however, a very demanding task, and even though a lot of progress has been achieved in this area, formal verification is far from being able to fully automatically check all relevant properties of complex designs without a significant and costly human involvement in the verification process. The thesis deals with these challenges by focusing on verification techniques based on formal approaches, but possibly relaxing or limiting their precision and generality to achieve full automation. Further, the thesis also focuses on the efficiency of the proposed techniques and their ability to deliver continuous feedback about the verification process. Special attention is devoted to the development of formal methods for checking the equivalence of microprocessor designs on various levels of abstraction. Although these designs cannot be behaviorally equivalent, they are required to give mutually corresponding results when executing the same input program, which is a property difficult to achieve. As another considered topic, the thesis proposes methods for checking correctness of mechanisms preventing data and control hazards in single-pipelined implementations of microprocessors. The approaches described in this thesis has been implemented in the form of several tools which, after examining designs of multiple pipelined microprocessors, were able to deliver promising experimental results.
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Automated Verification in HW/SW Co-design
Charvát, Lukáš ; Kubátová, Hana (oponent) ; Řehák, Vojtěch (oponent) ; Vojnar, Tomáš (vedoucí práce)
The subject of the thesis is to design new hardware verification techniques optimized for a process of HW/SW co-design in which hardware and software are developed in parallel to speed up the development of new embedded systems. Currently, microprocessor co-design tools typically allow to verify designs by simulation and/or functional verification. However, even extensive functional verification can miss some non-trivial bugs. Therefore, formal verification has become more and more desirable in recent years. As opposed to testing and bug-hunting techniques that only aim at detecting flaws, the goal of formal verification is to rigorously prove that the system is indeed correct. Formal verification is, however, a very demanding task, and even though a lot of progress has been achieved in this area, formal verification is far from being able to fully automatically check all relevant properties of complex designs without a significant and costly human involvement in the verification process. The thesis deals with these challenges by focusing on verification techniques based on formal approaches, but possibly relaxing or limiting their precision and generality to achieve full automation. Further, the thesis also focuses on the efficiency of the proposed techniques and their ability to deliver continuous feedback about the verification process. Special attention is devoted to the development of formal methods for checking the equivalence of microprocessor designs on various levels of abstraction. Although these designs cannot be behaviorally equivalent, they are required to give mutually corresponding results when executing the same input program, which is a property difficult to achieve. As another considered topic, the thesis proposes methods for checking correctness of mechanisms preventing data and control hazards in single-pipelined implementations of microprocessors. The approaches described in this thesis has been implemented in the form of several tools which, after examining designs of multiple pipelined microprocessors, were able to deliver promising experimental results.
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