Semiconductor integrated circuit including a system controlling circuit

Abstract

A system controlling circuit disclosed herein is made adaptable to programmable specification change through parameters under a secure environment that is tamper resistant. A semiconductor integrated circuit including functional blocks and a system controlling circuit is configured as below. The system controlling circuit includes a programmable timing controller and a second boot programmable sequencer and supplies a group of system control signals including at least one of a power supply control signal, reset signal, and clock signal to the functional blocks. In the system controlling circuit, the programmable timing controller adjusts either or both of sequence and timing of supplying the group of system control signals to the functional blocks, based on parameters supplied thereto and the second boot programmable sequencer reads in encrypted sequence code and data, decrypts them, and supplies the programmable timing controller with the parameters in accordance with decrypted sequence code and data.