| 摘要 |
A circuit (100) for protecting sensitive data stored in a storage area (108) includes a one time programmable device such as a fuse element (104) coupled to the input data path (102), and a one time programmable device such as fuse element (112) coupled to the output data path (118). Once sensitive data is loaded into the storage area (108), either one of, or both of the fuses (104, 112) can be activated (blown) in order to prevent access to the data stored in storage area (108). Optionally, a fuse element (130) can also be added to the internal circuit data line (120) that would prevent both internal and external access to the stored data.
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