Power supply voltage adjusting apparatus, recording medium, and power supply voltage adjusting method

A computer-readable recording medium storing therein design data of the power supply voltage adjusting apparatus comprising:

• a voltage setting part that, according to a characteristic variation of a semiconductor integrated circuit, sets a first power supply voltage of a first power supply domain module among a plurality of modules in the semiconductor integrated circuit, each module respectively having a different power supply voltage;
• a detecting part that compares phases of a first clock signal flowing through the first power supply domain module and a second clock signal flowing through a second power supply domain module to detect a phase difference;
• and
• a voltage adjusting part that adjusts a second power supply voltage supplied to the second power supply domain module to reduce the phase difference detected by the detecting part.

A power supply voltage adjusting method comprising:

• setting, according to a characteristic variation of a semiconductor integrated circuit, a first power supply voltage of a first power supply domain module among a plurality of modules in the semiconductor integrated circuit, each module respectively having a different power supply voltage;
• comparing phases of a first clock signal flowing through the first power supply domain module and a second clock signal flowing through a second power supply domain module;
• detecting a phase difference based on a comparison result at the comparing;
• and
• adjusting a second power supply voltage supplied to the second power supply domain module to reduce the phase difference detected at the detecting.