REQ-F-10 — A tricolour LED shall indicate output state: blue when in standby (RUN=0), green when running and output PG is valid (RUN=1, PG=1), red when running but output PG is not valid (RUN=1, PG=0). Logic: BLUE=!RUN · GRN=RUN·PG · RED=RUN·!PG, implemented via 74HC08/74HC04 gates.
approved · Functional
Statement
A tricolour LED shall indicate output state: blue when in standby (RUN=0), green when running and output PG is valid (RUN=1, PG=1), red when running but output PG is not valid (RUN=1, PG=0). Logic: BLUE=!RUN · GRN=RUN·PG · RED=RUN·!PG, implemented via 74HC08/74HC04 gates.
Acceptance Criteria
Walk all four logical states: (1) standby → blue; (2) run, PG valid → green; (3) run, PG invalid (e.g. mismatched DIP) → red; (4) overtemp latch → output off, OT LED separately lit.
Linked Test Cases
| Code | Title | Status |
|---|---|---|
TC-F-10 |
Output tricolour LED — walk all 4 display states | pass |
VAL-05 |
System validation: mismatched DIPs (Vin > Vout) → output ≈ Vin, LED red | pass |
Sign-offs
No sign-offs recorded. Approving a requirement records one here.