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Trigger Ring Operation Checking Method

IP.com Disclosure Number: IPCOM000077208D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Blum, A: AUTHOR [+5]

Abstract

This checking method serves to accurately check a check pulse controlled trigger ring which provides predetermined time intervals.

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Trigger Ring Operation Checking Method

This checking method serves to accurately check a check pulse controlled trigger ring which provides predetermined time intervals.

As for generating a particular time interval pattern, a number of switching state combinations are not required and are, therefore, not permissible. The trigger ring is controlled by a check logic indicating as errors nonpermissible switching state combinations.

A check for nonpermissible state combinations is not sufficient, however, as can be seen from Fig. 1A. Suppose, for example, trigger T(2-8) fails to be set at the appropriate time 2. In this case, the subsequent trigger T(3-9) is not set either if it is controlled by trigger T(2-8), and so on; in effect, the trigger ring stops. This is a permissible state combination and the check circuits do not respond.

The trigger ring can be checked, however, when the switching of each trigger in turn is monitored, via the check circuits, only by those triggers which are not controlled by the respective trigger and are not controlling it. Such control of the trigger ring can be achieved by controlling the nth trigger by the n-2 trigger.

This method fails if the trigger ring consists of an even number of stages. As is shown, by a trigger ring with n = 6 stages T, such a trigger ring can again be checked by dividing the trigger ring into two partial rings of n/2 stages each.

Fig. 1A shows the required time interval pattern that cannot be checked if it i...