Patent ID: 7779172

Claim:
An activator, comprising an event register in which an event requests that a direct memory access controller, which is connected to the activator, perform a direct memory access transfer, the event being among a set of events generated by a peripheral device on a computer system, the event being registered beforehand in the event register as second information by a CPU (central processing unit) of a computer system, wherein the direct memory access controller has a set of DMA controller registers storing first information for performing a direct memory access transfer, set by the CPU before the event is generated, and wherein the activator acquires an event generated by the peripheral device on the computer system, compares the acquired event with the event registered beforehand in the event register, and activates the direct memory access controller to perform data transfer between the peripheral device and a storage device by referring to the first information stored on the DMA controller register of the direct memory access controller that is associated with the second information in the event register when the two events match but does not activate the direct memory access controller when the two events do not match.