Adlsoft multiclock7/30/2023 Keywords: DFT (Design for testability), ATPG (Automatic test pattern generation), Simulation/Pattern validation, SPF (STIL protocol file). IntroductionĪTPG (Automatic test pattern generation) is the process of generating the test vectors for the particular test mode to check the manufacturing defects, which is further used by simulation tools for validation. ATPG is performed on scan inserted design and the SPF generated through scan insertion. Simulation is the later stage after ATPG, for the validation of the patterns generated in different formats.Īll the stages are interdependent on each other. Refer below figure to check the interdependency of all the stages. Simulation/Pattern validation plays a vital role in DFT, in order to examine the vectors generated by the ATPG tool. Once the design is ready with scan inserted netlist, test vectors will be generated and the same vectors will be used for simulation. If any Error or severe warnings occurs at ATPG/vector generation stage, it can either be solved at the same stage, else we need to jump to the SCAN stage for the required changes which help to clean ATPG issues. If the pattern simulation failure occurs, we need to analyze the failure and need to do the necessary changes in the ATPG stage like SPF modification to clean up the simulation failures. SPF stands for STIL(Standard test interface language) protocol file generated after the scan insertion stage, which consists of all the necessary and basic scan information. In general words, SPF portrays the information of scan structure, scan chain, initial state value for all the signals for particular test mode and furthermore.Īll the above-defined information in SPF is needed to guide the ATPG tool for DRC checks and pattern formatting. SPF is assigned at the run_drc stage to verify the compatibility of scan inserted netlist with the SPF, it further determines how the scan structure can be used to generate patterns and fault simulations. Read standard cell libraries, target libraries, link libraries, and other necessary libraries in Verilog format.Scan outputs are carried forward as ATPG inputs.Synopsis Tetramax ATPG flow till DRC Fig.1.2 – ATPG flow till DRC Basic ATPG flow Please check below SPF infrastructure segment for a more detailed structure of SPF.
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