{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp12_substrate_denial72_20260805","research_id":"eoa_inverse_innovation_exp12_light_screen_20260805","cell_id":"incentive_compatible_rule_design__computer_science","search_lanes":{"direct_problem_and_intervention":{"queries":["FPGA accelerator card shared power rail voltage droop neighboring card transient current backplane","backplane per slot hot swap current limiter local bulk capacitor reverse current blocking"],"source_ids":["SRC1","SRC2"],"no_result_note":null},"synonyms_and_historical_terms":{"queries":["distributed power architecture backplane point of load converter transient isolation local capacitance","AdvancedTCA shelf per slot current limiting hot swap circuit breaker"],"source_ids":["SRC2","SRC4"],"no_result_note":null},"products_practices_and_standards":{"queries":["eFuse current limit reverse current blocking output capacitor load transient application note","PICMG MicroTCA payload power current limit each slot"],"source_ids":["SRC3","SRC4"],"no_result_note":null},"component_combination":{"queries":["backplane per slot hot swap current limiter local bulk capacitor reverse current blocking","eFuse current limit reverse current blocking hold-up capacitor thermal shutdown pulsed overload"],"source_ids":["SRC2","SRC3","SRC4"],"no_result_note":null}},"sources":[{"source_id":"SRC1","title":"Neighbors From Hell: Voltage Attacks Against Deep Learning Accelerators on Multi-Tenant FPGAs","publisher":"arXiv / authors from the University of Toronto and Vector Institute","url":"https://arxiv.org/abs/2012.07242","source_type":"PRIMARY_RESEARCH","claims_supported":["Hardware experiments on a Stratix 10 card showed that aggressively switching one physically separated FPGA role can cause supply-voltage drops and timing violations in a neighboring role.","Abrupt load-current changes create transient voltage drops through power-distribution impedance, while distributed capacitance supplies current only briefly.","Aggressive clock gating can produce disruptive current changes without an explicitly malicious circuit, and sufficiently strong activity can crash the FPGA board."]},{"source_id":"SRC2","title":"Understanding Hot Swap: Example of Hot-Swap Circuit Design Process","publisher":"Analog Devices","url":"https://www.analog.com/en/resources/analog-dialogue/articles/understanding-hot-swap.html","source_type":"OFFICIAL_GUIDANCE","claims_supported":["An uncontrolled module and its local capacitance can cause backplane brownout and reset adjacent modules.","Established backplane practice places an onboard hot-swap controller on each plug-in module to limit inrush and continuously protect against overcurrent and short circuits.","The illustrated controller regulates branch current with a sense resistor and pass MOSFET, permits capacitor charging, and uses a timer plus MOSFET safe-operating-area and thermal analysis to bound sustained overload."]},{"source_id":"SRC3","title":"Basics of eFuses (Rev. A)","publisher":"Texas Instruments","url":"https://www.ti.com/lit/an/slva862a/slva862a.pdf","source_type":"OFFICIAL_GUIDANCE","claims_supported":["Commercial eFuses provide programmed current limiting, fast short-circuit interruption, thermal foldback or shutdown, and timed circuit-breaker behavior that permits bounded pulsed overloads.","The guidance explicitly discusses a large output hold-up capacitor and reverse-current risk, and identifies series diodes, controlled MOSFETs, and integrated blocking FETs as reverse-blocking solutions.","An ordinary protected branch can therefore combine local output capacitance, forward current limitation, reverse blocking, bounded overload ride-through, and local thermal shutdown."]},{"source_id":"SRC4","title":"Design Note 437: Hot Swap Solution Meets AMC and MicroTCA Standards","publisher":"Analog Devices","url":"https://www.analog.com/en/resources/design-notes/hot-swap-solution-meets-amc-and-micro-tca-standards.html","source_type":"FIRST_PARTY_PRODUCT","claims_supported":["A dual hot-swap controller was designed to meet MicroTCA card-power requirements using controlled inrush, adjustable analog current limiting, a timed circuit breaker, and fast overcurrent limiting.","The documented card application reduces excess load to its analog current-limit threshold, lets the card ride through short overloads, and turns off the payload path if overload persists.","The design localizes a payload fault to that power path and supplies individual card monitoring and control, showing that per-card protected power branches are established modular-computing practice."]}],"problem_evidence":{"status":"PARTLY_SUPPORTED","finding":"The electrical externality is visible: primary FPGA experiments show that one isolated compute role's abrupt, heavy current demand can induce neighboring timing faults, and backplane guidance documents uncontrolled module-capacitance current causing common-rail brownout and adjacent-module resets. The retained evidence does not directly test independently owned accelerator cards strategically timing ordinary workloads on the proposal's exact low-voltage backplane, so that narrower framing remains unverified.","source_ids":["SRC1","SRC2"]},"closest_prior_art":[{"name":"Per-module backplane hot-swap controller with load capacitance","source_ids":["SRC2"],"overlap":"Places an analog current-regulating pass element on every plug-in module, limits charge delivered to its local load capacitor, protects the shared backplane from disruptive current, and times or disconnects sustained overcurrent.","remaining_difference":"The source frames the circuit as inrush and fault protection rather than a deliberately sized, continuously interpreted charge account, and does not state a matched-capacitance experiment or a sum-of-refill-limits rule."},{"name":"eFuse branch with hold-up capacitor and reverse-current blocking","source_ids":["SRC3"],"overlap":"Combines nearly all material elements and behavior: programmable forward-current limiting, bounded pulsed overload, downstream stored charge, reverse blocking, fast short-circuit response, thermal foldback, and local shutdown or retry.","remaining_difference":"The report discusses these as protection features across eFuse applications and device families rather than presenting the proposal's complete multi-slot topology and incentive-compatible interpretation as one evaluated system."},{"name":"MicroTCA/AMC analog hot-swap power branch","source_ids":["SRC4"],"overlap":"Implements standardized per-card power control with analog current limiting, short-overload ride-through, persistent-fault cutoff, and fault localization to the payload path in a modular computing platform.","remaining_difference":"The documented implementation includes management and control signals and does not explicitly require reverse-isolated per-card reservoirs, matched total capacitance, or recharge ceilings whose sum is within source capacity."}],"prior_art_disposition":"SUBSTANTIAL_COLLISION","contrastive_claim_remaining":"Under matched source capability, wiring, sustainable branch ratings, and total capacitance, a reverse-blocked reservoir placed after each branch's refill-current limiter will cause cumulative excess charge to appear as that branch's capacitor-voltage loss and recharge delay before measurable quiet-neighbor disturbance, while still serving a predeclared legitimate burst envelope. The remaining distinction is narrow because ordinary hot-swap/eFuse branches already provide most of this topology and behavior; it rests on demonstrating a material causal difference from an ordinary current-limited branch with the same downstream capacitance and settings.","contrastive_claim_falsifier":"The contrast is falsified if a conventional per-slot eFuse, hot-swap controller, or converter with matched current limit and output capacitance produces statistically indistinguishable offending-slot voltage, neighbor-rail disturbance, overload ride-through, recharge, and thermal traces; it is also falsified if shared-rail droop precedes local reservoir depletion or if no component setting both serves legitimate bursts and contains sustained excess.","gates":{"adequate_source_search":{"status":"PASS","rationale":"The bounded search covered the proposal directly, historical hot-swap and distributed-power terminology, MicroTCA modular-power practice, commercial eFuses, and combinations of current limiting, downstream capacitance, reverse blocking, pulse ride-through, and thermal cutoff. Four opened sources span three publisher identities and include primary research plus manufacturer guidance and a first-party standards-oriented product note.","source_ids":["SRC1","SRC2","SRC3","SRC4"]},"supported_problem":{"status":"PASS","rationale":"The problem is partly supported: hardware research demonstrates compute-induced voltage interference, and backplane guidance documents common-rail brownout and adjacent-module reset from uncontrolled branch demand. Evidence for the exact strategic multi-card workload scenario is absent, preventing full support but not the gate.","source_ids":["SRC1","SRC2"]},"distinct_testable_claim":{"status":"PASS","rationale":"A narrow falsifiable claim remains about causal ordering and trace differences under matched constraints, specifically against an ordinary eFuse or hot-swap branch with equal downstream capacitance. Passing this gate does not overcome the substantial prior-art collision.","source_ids":["SRC2","SRC3","SRC4"]},"bounded_next_test":{"status":"PASS","rationale":"The proposed extra-low-voltage two-load comparison is bounded and can directly measure branch charge loss, quiet-neighbor disturbance, recharge, and temperature. It should include direct feed, common capacitance, an ordinary eFuse or hot-swap branch with matched output capacitance, and the proposed discrete branch; the ordinary protected branch is the decisive comparator.","source_ids":["SRC2","SRC3","SRC4"]},"no_obvious_safety_or_authority_stop":{"status":"PASS","rationale":"No obvious authority stop applies to an authorized, nonproduction, extra-low-voltage dummy-load fixture. Documented risks from stored charge, pass-element dissipation, short circuits, and overheating require current-limited supply operation, fusing, bleeders, rated components, enclosure, temperature monitoring, and immediate de-energization on abnormal behavior.","source_ids":["SRC2","SRC3"]}},"screen_survival":false,"world_novelty_boundary":"This bounded four-source screen cannot establish world novelty, patentability, market size, expert acceptance, or realized value. It finds substantial collision with established hot-swap and eFuse power-branch practice; unsearched patents, standards text behind access controls, converter implementations, and older power-distribution literature could narrow or eliminate the remaining matched-transfer claim."}