Patent attributes
A communication control apparatus for common bus connection devices is provided between a plurality of devices to which addresses are allocated and a common bus and controlling an access between each of the plurality of devices and the common bus, the communication control apparatus includes: an input determination unit configured to recognize an identification signal indicating the beginning and end of a packet for the common bus which is an information unit capable of being transmitted by one transfer operation through the common bus and determining whether or not there is an input from the common bus to the device in question, a transmission determination unit configured to determine whether or not there is a transmission of the packet from the device in question on the common bus to the common bus, and an access suspend unit configured to determine that another device on the common bus is performing a packet operation and suspending a clock in each unit in the device in question when the input determination unit determines that the address of the packet inputted through the common bus from the other device is not destined for the device in question and when the transmission determination unit determines that there is not a transmission request for the packet from the device in question.
