Apparatus for detecting data buffer faults

Details Apparatus for detecting data buffer faults Apparatus for detecting data buffer faults

1998-04-17

1999-03-16

Pan, Daniel H.

Excavating

395872, 395873, 395876, 39518401, 39518501, 39518502, 39518503, 39518504, 371 212, 371 24, 711110, G06F 1100

Patent

active

058841016

ABSTRACT:
A buffer monitor includes a first counter for counting bits of incoming data as they arrive at a data buffer that stores and then forwards the incoming data. Each bit of outgoing data resets the first counter's count. If its count reaches a first limit before being reset by an outgoing data bit, the first counter asserts an alarm. The buffer monitor also includes a second counter for counting bits of outgoing data as they depart the buffer. Each bit of incoming data resets the second counter's count. If its count reaches a second limit level before being reset by an incoming data bit, the second counter asserts an alarm. The first counter will sound an alarm when the buffer fails to forward output data after having received a substantial amount of input data. The second counter will assert an alarm when the buffer has forwarded a substantial amount of output data without having received any input data. Neither counter will assert an alarm when the buffer stops forwarding data simply because it hasn't received any data to forward.

REFERENCES:
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patent: 4803654 (1989-02-01), Rasberry et al.
patent: 4835774 (1989-05-01), Ooshima et al.
patent: 5471488 (1995-11-01), Bender
patent: 5633878 (1997-05-01), Ernkell et al.
Access I/O Products, Inc., WDG-CSM Watchdog and Computer System Monitor Card, published at http://www.acces-usa.com/wdgcsm.html, 1997, 3 pages.
OutSource Engineering & Manufacturing, Watchdog Cards . . . Product Descriptions and Prices, published at http://www.indim.com/.about.outsrc/watchdogs.html, 1997, 3 pages.

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