Synchronizer for a fault tolerant multiple node processing syste

Details Synchronizer for a fault tolerant multiple node processing syste Synchronizer for a fault tolerant multiple node processing syste

1987-04-15

1989-03-28

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 1516

Patent

active

048169897

ABSTRACT:
A synchronizer for each node in a multiple node processing system having a message interface for receiving sync and pre-sync time-dependent message, counter means for generating a local time, a time stamp memory having an entry for each node in the multiple node processing system, a time stamper responsive to receiving a time-dependent message from a node for storing the local time in the entry of said time stamp memory for that node to generate a time stamp. The synchronizer has a time stamp voter for generating a medial time stamp value from all the time stamps in the time stamp memory, a sync correction generator for generating a sync delta having a value corresponding to the difference between the voted time stamp and the node's own time stamp, means for adding said sync delta to a nominal transmission timing interval to generate an actual transmission timing interval, and a message generator for generating a pre-sync time dependent message passed to the transmitter at the end of the nominal transmission timing interval and for generating a sync time-dependent message passed to the transmitter at the end of said actual transmission timing interval.

REFERENCES:
patent: 4523273 (1985-06-01), Adams et al.
patent: 4630196 (1986-12-01), Bednar, Jr. et al.

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