Semiconductor integrated circuit device, method of controlling semiconductor integrated circuit device, and cache device

Abstract

There are provided a semiconductor integrated circuit device, a method of controlling a semiconductor integrated circuit device, and a cache device capable of efficiently implementing power saving, wherein the cache device includes a low-voltage operation enabling cache (), and a small-area cache () having a type different from that of the cache (), the cache () and the cache () being independently supplied with source voltage; the cache () being operable at a voltage lower than the lower limit voltage at which the cache () is operable; a cache control unit () operating switchable controls between a first mode allowing only the cache () to operate, and a second mode allowing the cache () or the cache () to operate; and the cache () in the first mode operating to supply a voltage below the lower limit voltage at which the cache () is operable, while interrupting power supply to the cache ().