| 摘要 |
IO buffers that operate with an IO power supply system and cut cells that isolate the IO buffers from each other are disposed on the periphery of an always-on power supply area and a power supply cut-off available area. A signal indicating the holding of an IO output(s) output from the always-on power supply area is wired so as to go round the IO buffers and the cut cells. The cut cell includes a level shifter that operates with an IO power supply system. The cut cell shifts the level of signal indicating the holding of IO output so that the signal level conforms to the power supply system of IO buffers, and outputs the resultant signal to the IO buffers.
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