| 摘要 |
A semiconductor integrated circuit device includes internal circuits divided into blocks that are controlled block by block for activation. Each internal circuit receives a clock signal from a clock distribution network of a block including that internal circuit. The clock signal is supplied to the clock distribution network by buses of a tree structure and a clock drive control gate. The clock drive control gate stops, in response to an enable signal for controlling activation of internal circuits block by block, the clock signal from being supplied, when internal circuits of a corresponding block are inactivated.
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