Measurement Protocol
Logic gate hardware within a digital processing unit performs fpga timestamping to establish the temporal point of packet arrival at an input interface. Signal transition occurs at the physical layer where the logic detects the rising edge of a data stream and latches the value of a high frequency counter. Absolute accuracy depends on the stability of the local oscillator driving the count cycles throughout the operation.
Temporal Resolution
Clock drift limits the precision of this logic across extended intervals of data collection. Oscillators shift output frequency as thermal conditions change inside the chassis. Calibration against a global navigation satellite system provides a stable reference for the internal counter to mitigate this inevitable divergence.
Compensating for propagation delay through the logic circuitry requires specific hardware paths with known latency profiles to maintain consistency.
Hardware Integration
Logic elements define the capture window by comparing incoming bit patterns against a programmed trigger sequence. Precise detection requires the separation of the capture logic from the main application data path to prevent bus contention or resource starvation. Routing delays within the programmable fabric create jitter that manifests as uncertainty in the captured event timing.
Verification Standard
Metrological traceability connects the recorded arrival of a signal to the coordinated universal time scale. Laboratory testing validates the variance of the capture circuit under controlled temperature gradients to determine the operational window of error. Independent timing references demonstrate that the hardware achieves microsecond fidelity when the environmental conditions remain within the specified range.
The reliability of the reported data rests on the documented interval between consecutive clock cycles and the integrity of the reference signal used during the initialization phase.
