Title: Time-of-day clock synchronization among multiple processing units

Abstract: Circuits and method for synchronizing and checking a plurality of time-of-day (TOD) clocks in a multiprocessing system. Unique hardware synchronizes the low order part of the TOD clocks and a unique method synchronizes the high order part in the same clocks by using carry pulses derived from an intermediate bit position in each TOD clock. The carry pulses from all TOD clocks are combined in an OR circuit with each clock to provide common carry pulses for synchronizing each TOD clock in the system.

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Inventors: Smith, Ronald Morton (Wappingers Falls, NY, US)

Application Number: 413296
Filing Date: 1973-11-06
Publication_date: 1976-01-13
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Class(es): 713/400 713/375
Other Classes:
US Patent Ref:

3715729	Feb, 1973	Mercy	340/172.
3761884	Sep, 1973	Ausan et al.	340/172.

Other Refs:
Primary Examiner: Shaw, Gareth D.
Assistant Examiner: Sachs, Michael C.
Attorney: Goldman; Bernard M.