High speed multiple event timer

Details High speed multiple event timer High speed multiple event timer

1977-01-10

1979-07-03

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92TF, 235 92DP, 235 92CC, 235 92R, 328129, H03K 2108

Patent

active

041601548

ABSTRACT:
Apparatus for measuring the time of a plurality of successive events with respect to a reference time or event using a master circuit divided into two parts of N and M cascaded stages for counting clock pulses with an early carry propagated from the first part to the second part when the most significant stage of the first part undergoes a transition to a maximum value; and a slave circuit also comprised of two parts of N and M stages, a first part which follows the first part of the master circuit, except during the presence of an event pulse, and produces a normal carry when its most significant stage undergoes a transition from a maximum to a minimum value, and a second part which is a register loaded from the second part of the master circuit by a carry from the first part of the slave circuit. In one embodiment, the first part of the slave circuit is also a register loaded from the first part of the master circuit by clock pulses except during the presence of an event pulse. In a second embodiment, the first part of the slave circuit is comprised of a counter which counts clock pulses in unison with the master circuit, except during the presence of an event pulse. A comparator compares the first parts of the master and slave circuits to inhibit counting clock pulses in the slave circuit following an event pulse until the first part of the master circuit has cycled through to the state of the first part of the slave circuit. In some applications the second parts of the master and slave circuits may be omitted.

REFERENCES:
patent: 3063631 (1962-11-01), Ray
patent: 3560723 (1971-02-01), Kamachi
patent: 3602699 (1971-08-01), Kamachi et al.
patent: 3649815 (1972-03-01), Clifford
patent: 3805031 (1974-04-01), Leibowitz et al.
patent: 3849635 (1974-11-01), Freedman
patent: 3939333 (1976-02-01), Keech
patent: 3982108 (1976-09-01), Horsley

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