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US 2006/0050580 A1Published application
Method for generating identification code of semiconductor device, method for identifying semiconductor device and semiconductor device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshiaki Yamaguchi, Tatsuya Furukawa, Koichi Shimokawa
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Abstract
A semiconductor device including memory cells such as flip-flops, RAMs or SRAMs is powered on, and first logic signals of Hi or Lo output from the respective memory cells are obtained. A combination of the logic signals is used as a unique identification code for identifying a semiconductor device.
Claims14
A method for generating an identification code of a semiconductor device including a plurality of elements outputting logical values, the method comprising the steps of:
- (a) obtaining logical values output from the respective elements when power is supplied to the semiconductor device;
- and
- (b) generating an identification code of the semiconductor device by using the logical values.
A semiconductor device, comprising:
- a logical value outputting circuit including a plurality of elements outputting logical values;
- and
- an identification information generating circuit for obtaining the logical values output from the respective elements and generating identification information of the logical value outputting circuit, when power is supplied to the logical value outputting circuit.
Dependencies are inferred from the claim text.