Method and apparatus for performing health tests of units of a d

Details Method and apparatus for performing health tests of units of a d Method and apparatus for performing health tests of units of a d

1990-10-05

1993-05-11

Beausoliel, Robert W.

Excavating

371 18, 3642671, 3642673, 3642674, 3642292, 36424292, 364DIG1, G06F 938, G06F 1100, G06F 1300

Patent

active

052107574

ABSTRACT:
A means for ascertaining the health, or basic operational status, of a system unit. A "health check" provides an indication of either "yes", the system unit is operational, or "no", the system unit is either inoperative or there is a question as to whether the system is operational. The test is performed by requesting that the system unit perform a high priority "short" operation and noting the response provided to the request; the actual execution of the request is unimportant and it is the response of the unit under test to the receipt of the request for a bus operation that is the actual indicator of the status of the unit being tested. The requested operation is not directed at the unit whose operational status is to be determined, but instead at a bus interface unit which performs bus operations for the unit to be tested and whose responses to requests for bus operations are effected by the operational status of the unit that is to be tested. The operation is not directed at an actual element in the bus interface unit, but at a phantom, or nonexistent, element.

REFERENCES:
patent: 4315311 (1982-02-01), Causse et al.
patent: 4764862 (1988-08-01), Barlow et al.
patent: 4910666 (1990-03-01), Nibby, Jr. et al.

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