Browse Prior Art Database

Synchronization of Clocks With Different Periods

IP.com Disclosure Number: IPCOM000074766D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Alvarez, JA: AUTHOR [+2]

Abstract

A technique is disclosed for advancing a counter at a fixed time interval with a clock which is not a subcycle of that interval. The technique also allows the time periods in which one clock may be incremented to be different from those time periods in which the set or store of the clock occurs.

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Synchronization of Clocks With Different Periods

A technique is disclosed for advancing a counter at a fixed time interval with a clock which is not a subcycle of that interval. The technique also allows the time periods in which one clock may be incremented to be different from those time periods in which the set or store of the clock occurs.

The drawing shows the time slots in which a time-of-day clock (TOD) may be set, stored or incremented: Bit 52 of the TOD clock is incremented every 480 ns. At the end of every twelfth 480 ns. period, the advance of bit 52 of the TOD clock is delayed 240 ns. The twelfth 480 ns. period may be detected by decoding either a binary 0 or a binary 12 in bits 49-52 of the TOD clock.

A 480 ns. period is divided into two 240 ns. periods. During the first 240 ns. period the clock may be incremented and during the second 240 ns. period the clock may be set or stored.

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