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Avery Design Systems Announces SimXACT 3.0 for Improved X-Verification

Avery Design Systems Inc., an innovator in functional verification productivity solutions, announced availability of release 3.0 of its patented SimXACT analysis solutions including major new features for analyzing and automatically eliminating X bugs in gate-level design simulation.

SimXACT automates the tedious process of analyzing X propagations in gate-level simulations due to RTL vs gate-level mismatches arising from X-optimism problems and gate-level simulator X-pessimism handling in glue logic and gated clocking and overly pessimistic library cell modelling. SimXACT’s hybrid formal analysis runs with your normal logic simulator and proves and then on-the-fly fixes any false Xs arising from X pessimism during the actual simulation run. SimXACT also provides an X analysis to debug X bugs from RTL vs gate-level simulation mismatches.

A new design and library analysis feature has been added to improve setup process by selecting the best SimXACT runtime options for performance based on design styles and to analyze SUDP models of sequential devices to isolate X-pessimism issues from inadequate models.

A design database has been added to cache initial analysis for use on subsequent runs of the full testsuite regression. Overall performance and memory has each been improved by more than 2X over prior releases. This makes analyzing designs of more than 10M DFFs possible without the need to divide the analysis into steps.

Finally to deal with X propagations arising from X-optimism issues caused by non-reset DFFs corrupting the state of downstream DFFs which previously held deterministic values after reset during functional simulation, SimXACT adds a built-in assertion to monitor DFFs for this potential RTL X bug and generates a time 0 random deposit that more closely tracks actual hardware semantics during the gate-level logic simulation.

Finally an XTrace database has been added along with a TCL-based sequential backtrace commands to “root cause” X propagations back to X sources. Using event-based X propagation analysis X sources can be searched back 100s to 1000s of clock cycles or even back to reset time.

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