Apparatus for protecting code ROM data in code ROM test
AssigneeAbov Semiconductor Co., Ltd.
InventorJong-Hong Bae
Life of this patent
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Abstract
Disclosed is a method and apparatus of a code read only memory (ROM) data capable of protecting code ROM data is easily read and plagiarized in field in case of testing a code ROM built-in a microcontrol unit (MCU) The apparatus for protecting data outputted from a code ROM has: a first encryptor for encrypting data outputted from the code ROM; a second encryptor for generating a read enable signal through an encryption process; and an output unit for dumping out the encrypted data outputted from the first encryptor in response to the read enable signal outputted from the second encryptor.
Claims17
An apparatus for protecting data outputted from a code read only memory (ROM), comprising:
- a first encryption means for encrypting data outputted from the code ROM;
- a second encryption means for generating a read enable signal through an encryption process;
- and
- an output means for dumping out the encrypted data outputted from the first encryption means in response to the read enable signal outputted from the second encryption means.
An apparatus for protecting data outputted from a code ROM, comprising:
- a control state machine unit for generating a control signal for a ROM test operation in response to the test enable signal and the clock signal;
- a MISR unit for inputting, compressing key data in synchronization with the clock signal in response to the test enable signal;
- an initializing means for providing an initialization value to the MISR unit in response to the test enable signal and the reset signal;
- a comparison unit for outputting the read enable signal by comparing value outputted from the MISR unit with an expected value;
- and
- an output means for dumping the code ROM data in response to a read enable signal.
Dependencies are inferred from the claim text.