Ensuring Fault Tolerance of Phase-Locked Clocks
Krishna Krishna, Shin, Butler · IEEE Transactions on Computers · 1985
Processors within a real-time multiprocessor system must be synchronized with as little overhead as possible. Although synchronization can be achieved via both software (e.g., interactive convergence and interactive consistency algorithms) and hardware (e.g., multistage synchronizers and phase-locked clocks), phase-locked clocks are most attractive due to their small overheads.