Monitoring and Verifying a Clock State of a Chip

A computer program product comprising a computer readable storage medium having a computer readable program stored therein, wherein the computer readable program, when executed on a computing device, causes the computing device to:

• responsive to identifying an access to the chip, scan the access to identify a chip register and a clock domain that will be accessed;
• determine whether a bit of a clock trust unit associated with the chip register and the clock domain indicates whether to trust a clock state associated with the bit in a logical clock state unit;
• responsive to the bit of the clock trust unit indicating that the clock state associated with the bit in the logical clock state unit is trusted, identify the clock state from the logical clock state unit;
• determine whether the clock state matches a clock state required by the access;
• and
• responsive to the clock state matching the clock state required by the access, forward the access to the chip for execution.

An apparatus, comprising:

• a processor;
• and
• a memory coupled to the processor, wherein the memory comprises instructions which, when executed by the processor, cause the processor to:
• responsive to identifying an access to the chip, scan the access to identify a chip register and a clock domain that will be accessed;
• determine whether a bit of a clock trust unit associated with the chip register and the clock domain indicates whether to trust a clock state associated with the bit in a logical clock state unit;
• responsive to the bit of the clock trust unit indicating that the clock state associated with the bit in the logical clock state unit is trusted, identify the clock state from the logical clock state unit;
• determine whether the clock state matches a clock state required by the access;
• and
• responsive to the clock state matching the clock state required by the access, forward the access to the chip for execution.