Find silicon bugs before tapeout.
BigEndian builds tests and coverage loops that find gaps hand-written testbenches miss in complex RTL headed for fab.
Hand-written testbenches exercise expected paths. Coordinated multi-agent stimulus can leave corner-case sequences untouched, bringing open holes back near tapeout.
Protocol-heavy interfaces build assertion gaps when legal handshake timing variants go untested. Bugs in those paths can pass RTL review and reach silicon.
Our review of early-access RTL submissions found the deepest coverage gaps in the last two weeks before sign-off, when new directed tests carry the greatest regression risk.
RTL to closed coverage, three steps
No simulator change needed. BigEndian runs in your current flow.
Link your RTL
BigEndian ingests design files and simulation scripts. Provide the top-level module and current coverage database. Your Makefile and testbench structure stay unchanged.
Generate targeted tests
The agent targets uncovered state space with coverage-driven stimulus, assertion templates, and constraint variants. Tests arrive as readable SystemVerilog for inspection, edits, and commits beside your existing testbench.
Coverage loops close
Run the generated tests in VCS, Xcelium, or Questa. BigEndian parses the resulting coverage report, finds open arcs, and synthesizes the next targeted constraint set. Repeat until targets are met.
Close coverage gaps in one automated pass
Mean reduction in open coverage holes after the first automated pass
Based on internal pilot data from 3 early-access teams
Faster coverage closure than adding directed tests manually
Based on internal pilot data from 3 early-access teams
For three weeks before tapeout, a multi-agent AXI corner case remained open. BigEndian synthesized a constraint variant in one pass and covered the sequence we could not reach manually. That made the pilot worthwhile.
Works with your simulator setup
No simulator migration. BigEndian connects to tools your team runs.
Coverage metric support: line, branch, condition, FSM, toggle
Close coverage gaps
Join verification teams finding the holes their testbenches miss before tapeout.
Request Early AccessAccepting design pilot teams now. No waitlist fee.