PERIPHERAL CONTROLLER AND SCSI BUS CONTROLLER

摘要

PROBLEM TO BE SOLVED: To provide a peripheral controller such as a peripheral control sling LSI which can reduce power consumption as much as possible while the burden of an outer processor is reduced by controlling the power consumption of the peripheral controller in accordance with the output of an activation start detection means and an activation termination detection means. SOLUTION: A power consumption control circuit 2 detects activation and supplies inner clocks to register groups 8-10 and I/O control circuits 11-13. The register groups 8-10 and the I/O control circuits 11.13 become operation possible states and commands held by a latch 6 are transferred to command registers in the respective register groups 8-10. When the command processing is terminated, the I/O control circuits 11-13 output command termination signals to a NOR gate 1 as an activation termination detection means and the NOR gate 1 outputs are inputted to the power consumption control circuit 2. The power consumption control circuit 2 stops again the inner clock outputs and returns to a low power consumption mode.