Connection control circuit and information storage apparatus

Details Connection control circuit and information storage apparatus Connection control circuit and information storage apparatus

2005-07-19

2005-07-19

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

C360S051000

Reexamination Certificate

active

06920006

ABSTRACT:
A connection control circuit having the function of controlling connection and disconnection of an information storage apparatus to and from a transmission line is constructed such that it uses a comparator to determine whether or not the level of operating clock signal output from a controller of the information storage apparatus is within a predetermined range, and if it is detected that the level of the operating clock signal departs from the predetermined range, the connection control circuit outputs a control signal to a by-pass circuit to disconnect the information storage apparatus from the transmission line loop. This enables the information storage apparatus to be disconnected from the loop even if the controller of the information storage apparatus does not function normally due to an abnormality of the clock or an abnormality of the power supply.

REFERENCES:
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patent: 5357491 (1994-10-01), Yamasaki
patent: 5938465 (1999-08-01), Fox, Sr.
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patent: 6459306 (2002-10-01), Fischer et al.
patent: 6498541 (2002-12-01), Den Besten et al.

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