Information processing system having diagnostic processor for de

Details Information processing system having diagnostic processor for de Information processing system having diagnostic processor for de

1990-06-19

1993-09-28

Harrell, Robert B.

Excavating

395575, 371 12, 371 151, 364266, 364267, 364DIG1, 3649449, 3649451, G06F 1130, G06F 1100

Patent

active

052492990

ABSTRACT:
In an information processing system comprising a diagnosing unit (15) for carrying out, in response to an activation signal (17), a diagnosing operation for a main memory (10), a standard processor (11 or 12), and a system controller (13), a state indication area (20) stores a state signal which is produced by a monitoring unit (18) monitoring the diagnosing unit to indicate whether the diagnosing operation is possible and impossible and which, when the diagnosing operation is impossible, makes a diagnosis control unit (19) control retry of the diagnosing operation. Through a request controller (27) operable as a read request supply unit, the state signal is read by a read request signal produced by a signal producing unit (21) to make a judging unit (29) make a delivery control unit (24) allow and inhibit, when the diagnosing operation is possible and impossible, delivery as the activation signal of a communication signal produced by the signal producing unit through a communication controller (25) operable as a communication request supply unit. The state signal is stored in the state indication area by a write request signal produced by the signal producing unit and sent through the request controller which is now operable as a write request controller.

REFERENCES:
patent: 4392208 (1983-07-01), Burrows et al.
patent: 4443849 (1984-04-01), Ohwada
patent: 4703446 (1987-10-01), Momose
patent: 4845614 (1989-07-01), Hanawa et al.

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