Digital monitor having memory readout by the monitored system

Details Digital monitor having memory readout by the monitored system Digital monitor having memory readout by the monitored system

1976-05-28

1978-04-11

Chapnick, Melvin B.

Boots, shoes, and leggings

235302, 235312, G06F 1100

Patent

active

040842622

ABSTRACT:
A digital monitor for monitoring the operation of a synchronous digital system. Proper operation of the monitored digital system is determined by storing a predetermined sequence of digital numbers in a memory. The bit patterns generated by the system being monitored are utilized as addresses to read the stored digital numbers. After each read cycle the digital number read from the memory is examined to determine if it has the proper value. If the value is not proper, a memory is set indicating that the system being monitored has malfunctioned. Additionally, the number of bit patterns checked during each cycle of the system is determined. If the correct number of patterns are not checked, the memory is also set indicating that a malfunction has occurred. Apparatus for monitoring a selected number of analog signals such as power supply voltages is also provided. Either of these tests may be inhibited by signals from the system being monitored or by signals from an external source.

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patent: 3518413 (1970-06-01), Holtey
patent: 3579199 (1971-05-01), Anderson et al.
patent: 3599146 (1971-08-01), Weisbecker
patent: 3700870 (1972-10-01), Howell
patent: 3745316 (1973-07-01), Olah
patent: 3838264 (1974-09-01), Maker
patent: 3919533 (1975-11-01), Einolf, Jr. et al.
patent: 3949205 (1976-04-01), Hubert et al.
patent: 3963908 (1976-06-01), Das

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