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July 4, 2024 13:34
…potential cases where a bitflip causes a stall due to activating a division lane that does not exist.
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- New input signal redundancy_enable_i to switch in between redundant and non-redundant modes. - New output signal fault_detected_o for statistics - Redundancy Implementation selected via Enum in fpnew_pkg. - For TMR based redundancy use a large ID, for DMR base use a small ID and stall for divisions renamed modules
- Removed recursive assignments that can cause trouble in simulation - Removed repeated assignments in always_comb of classifier that cause trouble in simulation - Fixed format selection can evaluate to X when faults are injected into Enum in simulation.
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Adds top level modules and ports for time-based redundancy e.g. protection against single event upsets.
Depends on #10 and redundancy cells PRs Redundancy Cells #25 and Redundancy Cells #26.
This changes the ports of the top level module. Newly added are:
fpnew_pkg::DEFAULT_NO_REDUNDANCYresults in the same unit as before)Testing
This version of FPNew can be error injected and analyzed for vulnerabilities to single event upsets with the
itemm/error_injectionbranch offpnew_tb.Synthesis
This version of FPNew can be synthesized with the scripts in the internal gitlab for the R5SCY and CVA6 Core configurations to evaluate area overhead. Depending on the choosen implementation (not disabled ofc), redundancy add 7% - 12% of Area and increases the length of the critical path by a similar amount.
Work in Progress Points