Method and apparatus for preventing unauthorized access to nonvolatile memory in electronic encoders having a voltage level detection circuit
First Claim
1. A method for reading data from non-volatile memory in an electronic encoding device such that unauthorized access to the data is prevented, the method comprising:
- writing a first set of data to the non-volatile memory;
generating a voltage detect signal during the writing, the voltage detect signal being representative of a source voltage applied to the non-volatile memory;
determining whether the writing was successful by evaluating the voltage detect signal;
reading data from the non-volatile memory responsive to the determination.
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Abstract
According to the present invention, a method is provided for reading data from non-volatile memory in an electronic encoding device such that unauthorized access to the data is prevented. In one embodiment, the method includes the steps of writing a first set of data to the non-volatile memory; generating a voltage detect signal during the writing, the voltage detect signal being representative of a source voltage applied to the non-volatile memory; determining whether the writing was successful by evaluating the voltage detect signal; and reading data from the non-volatile memory responsive to the determination.
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Citations
6 Claims
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1. A method for reading data from non-volatile memory in an electronic encoding device such that unauthorized access to the data is prevented, the method comprising:
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writing a first set of data to the non-volatile memory; generating a voltage detect signal during the writing, the voltage detect signal being representative of a source voltage applied to the non-volatile memory; determining whether the writing was successful by evaluating the voltage detect signal; reading data from the non-volatile memory responsive to the determination.
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2. A system for reading data from non-volatile memory in an electronic encoding device such that unauthorized access to the data is prevented, the system comprising:
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means for writing a first set of data to the non-volatile memory; means for generating a voltage detect signal during the writing, the voltage detect signal being representative of a source voltage applied to the non-volatile memory; means for determining whether the writing was successful by evaluating the voltage detect signal; and means for reading data from the non-volatile memory responsive to the determination.
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3. An electronic encoding device comprising:
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a non-volatile memory; a controller coupled to the non-volatile memory; encoder logic coupled to the non-volatile memory; input logic coupled to the controller; output logic coupled to the non-volatile memory; and a voltage level detection circuit coupled to the non-volatile memory, which provides a signal responsive to a non-volatile memory write voltage to enable a read from said non-volatile memory. - View Dependent Claims (4)
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5. A method for reading data from non-volatile memory in an electronic encoding device such that unauthorized access to the data is prevented, the method comprising:
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writing a first set of data to the non-volatile memory; generating a voltage detect signal during the writing, the voltage detect signal being representative of a write voltage applied to the non-volatile memory; determining whether the writing was successful by evaluating the voltage detect signal; reading data from the non-volatile memory responsive to the determination.
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6. An electronic encoding device comprising:
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and non-volatile memory; a controller coupled the non-volatile memory; encoder logic coupled to the non-volatile memory; input logic coupled to the controller; output logic coupled to the non-volatile memory; and a voltage level detection circuit coupled to the non-volatile memory, which provides a signal responsive to a source voltage applied to the non-volatile memory, during writing to said non-volatile memory the signal being enabling of a read from said non-volatile memory.
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Specification