Key based register locking mechanism
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Sep 4, 2003
app pub date -
Aug 12, 2002
filing date -
Mar 1, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A key based locking system for guarding against improper or invalid access to internal registers of a core. Two key values are held in at least one lock register and sequential writes of the first and second keys within a predetermined period are required to unlock access to a protected register. Access to the protected register may then be permitted for the rest of the clock cycle, or alternatively may be permitted until a lock command is received.
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