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US 8,913,454 B2Granted
Programmable memory with restricted reprogrammability
AssigneeCambridge Silicon Radio Limited
InventorMel Gerard Long
Life of this patent
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Abstract
A reprogrammable memory, which can be, programmed a limited number of times. A plurality of one-time programmable elements are combined by a logic arrangement such that the output of that logic arrangement may be reprogrammed a limited number of times.
Claims9
A system to control access to a test mode, the system comprising:
- a logic device having a plurality of inputs and an output, wherein a signal at the output changes each time a signal at one of the inputs changes, the output sequentially changing between a value which allows access to the test mode and a value which does not allow access to the test mode;
- and
- a one-time programmable element connected to each of the inputs, each element providing a first output signal prior to programming of that element and a second output signal after programming of that element.
Dependencies are inferred from the claim text.