{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp12_substrate_denial72_20260805","cell_id":"backcasting_pathway_design__computer_science","arm":"CONSTRAINED_HIGH","candidate_id":"backcasting_pathway_design__computer_science__CONSTRAINED_HIGH","decision":"PROPOSAL","abstention_reason":null,"proposal":{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp12_substrate_denial72_20260805","cell_id":"backcasting_pathway_design__computer_science","arm":"CONSTRAINED_HIGH","candidate_id":"backcasting_pathway_design__computer_science__CONSTRAINED_HIGH","proposal_index":1,"version":0,"title":"Reverse-Derived Analog Power-Prerequisite Chain for Storage Compute Boards","problem":"A storage-bearing compute board can expose memory or controller components to an unsafe partially powered state during connector bounce, brownout, or startup. Timer-based or firmware-controlled sequencing may advance even though an electrically necessary prerequisite rail has not reached or maintained its valid range. The concrete problem is downstream power or write-enable becoming physically available before every required upstream electrical condition exists.","actors":["Storage-bearing compute board","Nonvolatile-memory device","Storage controller","Clock and reset circuitry","Input and auxiliary power rails","Board electrical engineer","Bench safety reviewer"],"observable_state":"Oscilloscope traces show a downstream rail or memory write-enable becoming active while an upstream supply, reference, clock-valid signal, or reset condition is outside its specified electrical window or has not remained stable for its required dwell interval.","consequence":"The board enters a partially powered state that can cause electrical stress, indeterminate controller behavior, or loss of recoverability for an interrupted write.","affected_objective":"Integrity and recoverability of stored state under startup and power-transient conditions.","intervention":"Add a removable, microcontroller-free analog sequencing daughtercard whose topology is derived backward from the desired endpoint of a safely writable storage device. Beginning at that endpoint, identify the immediately necessary electrical conditions, then repeat for each prerequisite until reaching the input supply. Encode the resulting dependency path as serial window comparators, analog dwell networks, MOSFET load switches, reset clamps, and reverse-order discharge paths. A stage receives energy only while its preceding physical conditions are within range for the required dwell; loss of a prerequisite directly opens downstream switches and discharges dependent nodes without software, reporting, or human action.","structural_mapping":[{"archetype_element":"Desired Future State","domain_realization":"The memory interface is writable only when the storage rail, controller rail, reference, clock-valid state, and reset release are simultaneously electrically valid."},{"archetype_element":"Future Success Criteria","domain_realization":"At every exposed test point, downstream energization and write-enable remain physically unavailable whenever any mapped prerequisite is outside its specified voltage or dwell window."},{"archetype_element":"Prerequisite Condition","domain_realization":"Each required rail range, reference level, oscillator-ready signal, reset state, and minimum stabilization interval is represented as a measurable electrical condition rather than an activity or date."},{"archetype_element":"Reverse Milestone","domain_realization":"Each comparator-and-switch stage marks a condition-rich readiness boundary: the next dependent stage cannot energize until the preceding boundary is satisfied."},{"archetype_element":"Dependency Map","domain_realization":"Copper traces connecting comparator outputs to downstream load-switch gates physically encode which electrical conditions must precede which others, including permitted parallel branches."},{"archetype_element":"Present Commitment","domain_realization":"The first stage immediately commits input energy only to the minimal auxiliary supervision rail; all later energy commitments remain physically withheld until their prerequisites exist."},{"archetype_element":"Baseline Current State","domain_realization":"The comparison board uses its existing timer, firmware sequence, or independent supervisors, allowing downstream activation to be compared under identical imposed input transients."},{"archetype_element":"Feasibility Constraint","domain_realization":"Comparator common-mode limits, switch voltage ratings, inrush current, rail-discharge time, backfeed paths, and device-specific sequencing limits bound the realizable chain."},{"archetype_element":"Pathway Assumption","domain_realization":"The chain assumes the selected voltage windows and dwell conditions are necessary physical precursors of the safe endpoint; bench tests separately challenge each assumption."},{"archetype_element":"Monitoring Trigger","domain_realization":"Test pads expose every stage transition for oscilloscope verification, but observation is not required for the chain to gate or remove energy."},{"archetype_element":"Pathway Owner","domain_realization":"The board electrical engineer owns the component values and dependency schematic, subject to laboratory electrical-safety review."}],"mechanism_mapping":[{"mechanism_slug":"analog_window_detection","role":"Translates every prerequisite into a local physical true-or-false condition by comparing a rail or reference with fixed electrical thresholds.","counterfactual_removal":"Without window detection, the chain would advance from elapsed time or uncontrolled voltage rise and would no longer enforce condition-rich reverse milestones."},{"mechanism_slug":"hardwired_dependency_gating","role":"Uses comparator outputs and copper connections to make each downstream MOSFET gate physically dependent on all required predecessor states.","counterfactual_removal":"Removing these causal connections permits a downstream stage to energize independently, destroying the reverse dependency structure."},{"mechanism_slug":"analog_dwell_filter","role":"Requires a prerequisite to persist by charging a resistor-capacitor network before the next stage can conduct, distinguishing stable readiness from transient threshold crossing.","counterfactual_removal":"A brief bounce could satisfy the voltage threshold and propagate an unsafe false milestone."},{"mechanism_slug":"reverse_order_energy_withdrawal","role":"On prerequisite loss, clamps reset, opens dependent switches, and discharges downstream nodes before upstream support disappears.","counterfactual_removal":"The startup path might be correct while brownout still leaves downstream devices partially powered, so the endpoint invariant would not survive reversal."}],"causal_chain":["Define the terminal physical state in which the storage interface may safely become writable.","Reason backward to the rail, reference, clock, and reset conditions that must already hold, continuing until the input supply is reached.","Represent each prerequisite with an analog window detector and, where needed, a physical dwell network.","Wire each detector to the load switch or clamp controlling only its dependent downstream stage.","Input energy can therefore traverse the chain only after the reverse-derived prerequisite states become true in dependency order.","If any prerequisite becomes false, hardwired gates isolate and discharge its downstream dependents without waiting for computation or intervention.","Preventing the mapped partially powered states removes one physical route to electrical stress and interrupted-write corruption."],"baseline":"Use the unmodified board's current sequencing arrangement under the same current-limited supply, dummy loads, probe placement, temperature range, and imposed startup or brownout waveforms. If no existing sequence is available, use a timer-only chain with the same nominal interstage delays as the comparison baseline.","nearest_rivals":["A firmware-controlled microcontroller or programmable power-management sequencer","An integrated hardware power-sequencing IC configured with equivalent prerequisite inputs","Independent voltage supervisors feeding one global reset signal","Additional bulk capacitance or a hold-up supply that rides through short brownouts","A timer-only analog sequencer with fixed delays but no condition dependency"],"remaining_contrastive_claim":"The bounded claim is structural: within the tested electrical envelope, a hardwired chain of prerequisite windows can make downstream energy and write-enable physically unavailable whenever a mapped predecessor condition is false, without code or human procedure. No claim is made that it outperforms an equivalently configured integrated hardware sequencer or that the selected prerequisites are complete beyond the tested board.","authority_safety":{"decision_authority":"The board electrical engineer and laboratory electrical-safety reviewer jointly authorize component limits and bench energization; production deployment remains outside this candidate.","authorized_first_step":"Build one removable low-voltage daughtercard and test it with a current-limited supply and non-storage dummy loads before connecting any memory device.","excluded_actions":["Connecting the prototype to production storage or irreplaceable data","Bypassing fuses, current limits, isolation, or manufacturer absolute-maximum ratings","Changing production firmware or deploying the circuit in operational equipment","Treating comparator outputs as authorization to exceed laboratory safety boundaries"],"halt_rollback":"Stop if any component exceeds its rated voltage, current, or temperature; if an unmapped backfeed path appears; or if downstream energy remains present after a prerequisite fails. Cut the current-limited supply, verify discharge, remove the daughtercard, and restore the original jumper configuration."},"negative_tests":{"strongest_counterevidence":"Representative failures occur only after all mapped electrical prerequisites are stable, or an equivalently configured integrated sequencer already enforces the same dependency chain; either result weakens the proposed problem-intervention match.","problem_falsifier":"Synchronized rail, reset, clock-valid, and write-enable traces from representative failure-inducing transients show no downstream activation while any specified prerequisite is false, and controlled prerequisite violations do not reproduce the hazardous partial-power state.","intervention_falsifier":"Under the predeclared transient matrix, any mapped prerequisite can be made false while its dependent downstream rail or write-enable remains active beyond the component-defined discharge allowance, or the daughtercard itself creates an unsafe partial-power state absent from baseline.","risks":["Incorrect thresholds or dwell values could block valid startup or admit an unsafe state.","Comparator chatter or probe-induced loading could misrepresent stage behavior.","MOSFET body diodes and interface pins could create unmodeled backfeed paths.","Added discharge paths could increase current or thermal stress.","A linear dependency chain could omit legitimate parallel prerequisites or conceal a cyclic dependency.","Bench success with dummy loads may not transfer to the actual device's dynamic current and pin behavior."]},"next_evidence_step":"On a non-production fixture, impose a predeclared matrix covering slow ramp, fast ramp, connector bounce, brief undervoltage, sustained brownout, and one-at-a-time prerequisite loss. Record every rail, reset, and write-enable node for the baseline and daughtercard. Accept further investigation only if the daughtercard keeps every dependent node inactive whenever its mapped predecessor is false, releases stages after valid dwell without exceeding ratings, and removes dependent energy in the specified reverse order. This step tests physical feasibility and mapping completeness but does not authorize connection to stored data.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed against other proposals because runtime isolation forbids inspection; this candidate is derived only from the supplied archetype and computer-science domain card.","revision_record":{"parent_version":null,"progress_targets_addressed":["Construct one substrate-compliant initial candidate","Preserve desired-future anchoring and reverse dependency logic","Make the essential intervention independent of software and governance wrappers"],"conceptual_changes":["Initial version maps a desired safe storage endpoint to a physically embodied reverse prerequisite chain."],"operational_changes":["Initial version limits the first step to a removable low-voltage daughtercard, dummy loads, current limiting, and explicit rollback."],"evidence_changes":["No external evidence or prior-art search used; a bounded bench falsification matrix is specified."],"claim_changes":["Claims are restricted to physical gating within the tested electrical envelope and exclude novelty, prevalence, comparative superiority, and effect size."]},"substrate_contract":{"primary_allowed_process":"HYBRID_OTHER_ALLOWED_PRIMARY","counterfactual_independence":"The primary process is direct analog measurement and energetic switching: voltage differences change comparator states, resistor-capacitor networks embody dwell, and transistor conduction physically admits or removes electrical energy. If all software, algorithms, databases, dashboards, reporting, incentives, authorization rules, training, and procedural enforcement are removed after installation, the comparator-to-MOSF chain still withholds downstream power when a prerequisite is false and withdraws it when that prerequisite is lost.","forbidden_channel_audit":"No microcontroller, programmable logic, model, database, network connection, recommender, dashboard, or software control loop is part of the operative path. Test pads and oscilloscope recording are diagnostic only. Human review selects safe component values and authorizes the bench experiment but does not perform the moment-to-moment intervention. The essential effect is neither reporting nor compliance: it is the physical interruption and discharge of electrical energy through hardwired analog components."}}}