Security device intended to be connected to a processing...

Details Security device intended to be connected to a processing... Security device intended to be connected to a processing...

2007-05-24

2011-10-11

Butler, Dennis M (Department: 2115)

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

Multiple or variable intervals or frequencies

C713S001000, C713S600000

Reexamination Certificate

active

08037339

ABSTRACT:
Example embodiments relate to a security device having two communication interfaces sharing at least one pin, each interface being capable of operating according to either of two predetermined communication protocols. The security device may further include a frequency detector to detect the frequency of a clock signal on the shared pin. Depending on the value of the detected frequency, and to which of a plurality of predetermined frequency ranges the detected frequency pertains, the security device may function according to one of the two predetermined communication protocols, operating at two different frequencies.

REFERENCES:
patent: 2004/0089725 (2004-05-01), Hill
patent: 2004/0134992 (2004-07-01), Guez et al.
patent: 2004/0249625 (2004-12-01), Leaming
patent: 2005/0081076 (2005-04-01), Okuda
patent: 2007/0158439 (2007-07-01), Conner et al.
patent: 1 457 922 (2004-09-01), None

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