Event counting prescaler

Details Event counting prescaler Event counting prescaler

1985-06-13

1989-07-18

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 750

Patent

active

048499242

ABSTRACT:
An apparatus for counting occurrences of a plurality of events characterized by unique event numbers includes a random access memory for storing event count numbers at addresses corresponding to the event numbers. The memory is addressed by an event number as the associated event occurs, and the event count number stored at such address is read and latched to an input of an adder. The adder increments the latched event count number and the incremented event count number is then written back into the memory at the current event number address. A buffer is provided to store the current event number whenever the adder overflows as a result of a count. Several such event numbers may be stored in the buffer for subsequent retrieval by an external controller thereby permitting the controller to determine when an event has been counted a fixed number of times and to increment its own internally stored count at a slower rate than the rate at which data is applied to the prescaler.

REFERENCES:
patent: 3505511 (1970-04-01), Campano et al.
patent: 3538318 (1970-11-01), Clutterbuck et al.
patent: 3564227 (1971-02-01), Bowers
patent: 3771144 (1973-11-01), Belady et al.
patent: 4016545 (1977-04-01), Lipovski
patent: 4092819 (1978-06-01), Takase
patent: 4445414 (1981-05-01), Smith

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