Registers – Systems controlled by data bearing records – Time analysis
Patent
1976-10-29
1978-07-11
Smith, Jerry
Registers
Systems controlled by data bearing records
Time analysis
324 73R, 324 73AT, G06F 1100, G01R 1512
Patent
active
040996689
ABSTRACT:
A monitoring circuit for digital circuits is disclosed. The monitor is primarily applicable to digital circuits which operate in a cyclic mode with the digital patterns generated during each cycle being repeated in a predictable manner. A predetermined number of expected bit patterns are stored in a programmable memory. The stored bit patterns correspond on a bit-by-bit basis to the bit patterns generated by the circuit being monitored when this circuit is operating normally. In the self-scan mode each pattern generated by the circuit being monitored is compared to each of the patterns stored in the memory in a sequential manner. Each time a pattern generated by the circuit being monitored is found to identically correspond to a pattern stored in the memory a valid pattern pulse is generated which steps a down counter one count. If this process does not result in the down counter being stepped the expected number of times during the operating cycle, a flip-flop is set indicating that the circuit being monitored has malfunctioned. Provisions are also included for counting the transitions of a digital signal during predetermined portions of the cycle of the circuit being monitored and for monitoring the polarity and amplitude of a predetermined number of analog voltages. The result of all of these tests are combined to generate a signal indicating the operational status of the circuit being monitored. The monitoring circuit may also be operated in a one-to-one correspondence mode. In this mode each bit pattern generated by the circuit being monitored are compared to bit patterns stored in a selected memory location. If these bit patterns are not identical, a malfunction signal is generated.
REFERENCES:
patent: 3821645 (1974-06-01), Vinsani
patent: 3832535 (1974-08-01), Vito
patent: 3883801 (1975-05-01), Hess
patent: 3904861 (1975-09-01), McNamara
patent: 3924181 (1975-12-01), Alderson
patent: 3988670 (1976-10-01), Gariazzo
Daggett Kenneth E.
Feilchenfeld Michal M.
Lloyd Raymond A.
Hinson J. B.
Smith Jerry
Westinghouse Electric Corp.
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