System LSI having a substrate-bias generation circuit with a substrate-bias control-value storage unit

摘要

A system LSI including substrate-bias generation circuits for supplying substrate biases independent of each other to functional modules integrated in the system LSI, a substrate-bias control circuit for controlling the substrate-bias generation circuits and a substrate-bias control-value storage unit for storing control values to be supplied to the substrate-bias generation circuits. The control values stored in the substrate-bias control-value storage unit are set by carrying out a predetermined operation. As a result, it is possible to provide a device for implementing both a high-speed operation and low power consumption without lowering the yield and for finely controlling the power consumption during the operation.