Real-time (RT) electron temperature () diagnostics are fundamental for active profile control in tokamaks. This paper present a field-programmable gate array-based RT Thomson scattering processor deployed on the HL-3 tokamak. Driven by strict RT constraints, the fully pipelined architecture integrates Z-score standardization with a lookup-table inversion. This removes the explicit amplitude degree of freedom in the mapping definition, fundamentally mitigating sensitivity to global signal scaling. The hardware achieves a deterministic trigger-to-output latency of . To guarantee RT data reliability for prospective closed-loop control, a firmware-level gating mechanism explicitly flags low-confidence samples, bounded by a Monte Carlo baseline error assessment. Benchmarked against an offline non-linear least-squares reference via a shared-trigger setup, the system demonstrates exceptional agreement across 142 valid pulses, yielding a linear fit of (). Validated under 30 Hz single-point operation, this architecture establishes a definitive microsecond-latency foundation for future multi-point RT upgrades.