Patent
1996-08-08
1998-10-20
Butler, Dennis M.
395558, G06F 104, G06F 114
Patent
active
058260668
ABSTRACT:
A computing system develops time/date values by using a free-running counter to measure and accumulate increments of time. The increments of time are converted from the resolution of the free-running counter to that used for the time and date values by dividing by a conversion variable and then used to update the time/date value. The accuracy of the time/date value is monitored by periodically comparing the rate of the free-running counter to the rate of a more accurate, external clock. The ratio of these two rates is used to adjust the conversion variable. The conversion variable reflects any differences between (1) the rate of change of the increments of time used for developing the time/data value and (2) the external clock. Its use here, therefore, will operate to either slow down or speed up the rate of change of the time/date value so that it more closely tracks the external clock.
REFERENCES:
patent: 4575848 (1986-03-01), Moore et al.
patent: 4746920 (1988-05-01), Nellen et al.
patent: 5526515 (1996-06-01), Ross et al.
patent: 5530846 (1996-06-01), Strong
Improved Algorithms for Synchronizing Computer Network Clocks, by David L. Mills, IEEE/ACM Transactions of Networking, vol. 3, No. 3, Jun. 1995.
Jardine Robert L.
Moiin Hossein
Butler Dennis M.
Tandem Computers Incorporated
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