Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Identifying or correcting improper counter operation
Patent
1984-07-19
1986-08-12
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Identifying or correcting improper counter operation
377 56, 371 67, H03K 2140
Patent
active
046060570
ABSTRACT:
The isochronism of binary counters can be checked by comparing the counting positions. If in a system two counters are required which are operated isochronously but not in synchronism, for example the individual read and write counters for memory addressing purposes, the arrangement according to the invention provides a simple solution by using one counter as a duplicate of the other one instead of duplicating both counters. The parity of the counting position after each increment of both counters is generated. The parity bit of the counter having the highest counting position is delayed by means of a shift register over a number of positions corresponding to the difference in counting positions between the two counters and is then compared with the parity of the counting position of the other counter.
REFERENCES:
patent: 3113204 (1963-12-01), O'Brien
patent: 3117219 (1964-01-01), Merfeld
patent: 3526758 (1970-09-01), Nozawa
patent: 3668431 (1972-06-01), Locke
patent: 3911261 (1975-10-01), Taylor
patent: 4107649 (1978-08-01), Kurihara
patent: 4130818 (1978-12-01), Snyder
Bohlmeyer Nicolaas
Hartman Johan E. A.
van Baardewijk Johannes
Cannon, Jr. James J.
Haken Jack E.
Heyman John S.
U.S. Philips Corporation
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