Circuitry and method that allows for external control of a data

Details Circuitry and method that allows for external control of a data Circuitry and method that allows for external control of a data

1996-11-26

1997-10-14

Fears, Terrell W.

Static information storage and retrieval

Addressing

Particular decoder or driver circuit

365201, 365233, G11C 1300

Patent

active

056778910

ABSTRACT:
A data security device is unitarily formed in an integrated circuit. A processor of the data security device operates in response to a clock signal provided at a clock input of the processor. Clock signal generation circuitry generates an internal clock signal. First processor-readable program code is configured to cause the processor to detect an internal, protectable, non-volatile indication of a state of the integrated circuit data security device. For example, one indication may be that non-volatile memory of the data security device has never been initialized. Another indication may be that the non-volatile memory of the data security device contains a manufacturing test pattern. Clock signal selection circuitry selectively provides a path for either the internal clock signal to be provided to the clock input of the processor or, alternatively, for an externally-provided clock signal to be provided to the clock input of the processor. Second processor-readable program code is configured to cause the processor to control the selection by the clock signal selection circuitry responsive to the state indication.

REFERENCES:
patent: 5499218 (1996-03-01), Ahn et al.
patent: 5557573 (1996-09-01), McClure

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