Protecting hidden content in integrated circuits
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United States of America Patent
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Nov 7, 2017
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N/A
app pub date -
Mar 23, 2015
filing date -
Mar 23, 2014
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Abstract
Various integrated circuits protect hidden content e.g., embedded instruments, keys, data, etc.) using scan cell circuit(s). For example, a first scan cell circuit is connected to the hidden content, and a second scan cell circuit is connected to the first scan cell circuit forming all or part of a serial data path. The first scan cell circuit provides access to the hidden content whenever the first scan cell circuit is in a first specified state and prevents access whenever the first scan cell circuit is in a different state. The first scan cell circuit does not interrupt the serial data path when the first scan cell circuit is in the different state. The second scan cell circuit changes an operational characteristic of the first scan cell circuit whenever the second scan cell circuit is in a second specified state. In some cases, the second scan cell circuit can be eliminated.
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