Patent ID: 8190924
Filing Date: 2012-05-29
Classification: G06F

Abstract:
1. A computer system comprising: a host Central Processing Unit (CPU) that transmits a sleep request signal; a processor having an execution mode and a suspension mode, the execution mode being a mode for executing a program, and the suspension mode being a mode for suspending the program execution by transmitting a sleep response signal to the host CPU, in response to a sleep request signal received from the host CPU; and an access controller configured to access a functional block in response to a command request issued by said processor, and to assert, to said processor, a command reception signal responding to the command request, wherein, in response to the sleep request signal from the host CPU, said processor transmits the sleep response signal to the host CPU, and asserts, to said access controller, a suspension notification signal indicating a switch to the suspension mode, the suspension notification signal being functionally distinct from the sleep response signal, and when the suspension notification signal is received from the processor, said access controller is configured to withhold asserting the command reception signal to said processor as a response to the command request.