Method and apparatus for identifying defective bus devices

Details Method and apparatus for identifying defective bus devices Method and apparatus for identifying defective bus devices

1988-07-08

1990-08-21

Smith, Jerry

Excavating

G06F 1100

Patent

active

049512838

ABSTRACT:
A technique for automatically diagnosing the failure of electronic devices connected to share a common bus. All bus devices are first disabled, and the bus is examined to determine if a failed device is interfering with normal operation by causing the bus to be stuck at a logic high or a logic low level. If the bus is stuck low or high, a forcing voltage nearly equal to either V.sub.ol or V.sub.oh, respectively, is applied to the bus, with all devices still disabled. A disabled bus current is then measured. One at a time, the bus devices are enabled, and the current on the bus measured to determine an enabled bus current. If, for a particular device, the enabled bus current exceeds the disabled bus current by a predetermined amount depending on the drive current specification of the device, it is concluded that the particular device is operating properly.

REFERENCES:
patent: 4514845 (1985-04-01), Starr
patent: 4713607 (1987-12-01), Pepper

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