Integrating Internal and External Clock Synchronization

Fault-Tolerant External Clock Synchronization

We address the problem of how to integrate faulttolerant internal and external clock synchronization. We propose a new algorithm which provides both external and internal clock synchronization for as long as no more than F reference time servers out of a total of 2F+1 are faulty. When the number of faulty reference time servers exceeds F , the algorithm degrades to a fault-tolerant internal clo...

Design Example for Internal and External Clock Synchronization in COSMOS

حلقۀ قفل تأخیر پهن باند با پمپ بار خودتنظیم و بدون مشکل عدم تطبیق

Almost all logic systems have a main clock signal in order to provide a common timing reference for all of the components in the system. Supporting the highest bandwidth data rates among devices requires advanced clock management technology such as delay-locked loops (DLLs). The DLL circuitry allows for very precise synchronization of external and internal clocks. In this paper a low jitter and...

A PI Consensus Controller for Networked Clocks Synchronization

In this paper we propose a novel distributed clock synchronization protocol for networks of clocks which have different initial offsets and internal clock speeds. The algorithm is based on an PI-like consensus protocol where the proportional (P) part compensates the different clock speeds while the integral part (I) eliminates the different clock offsets. This synchronization protocol is formal...

Optimal Deterministic Remote Clock Estimation in Real-Time Systems

In an OPODIS’06 paper, we laid down the foundations of a real-time distributed computing model (RT-Model) with non-zero duration computing steps, which reconciles correctness proofs and realtime schedulability analysis of distributed algorithms. By applying the RT-Model to the well-known drift-free internal clock synchronization problem, we proved that classic zero step-time analysis sometimes ...