Abstract: In the case of mounting two serial communication interfaces such as PCI-e and USB 3.0 with standards different from each other, it is allowed to flexibly address a design change and the like, and reduce a board area. An interface device is provided with a PCI-e PHY I/F, a USB 3.0 PHY I/F with equivalent specifications of a PIPE I/F to that of the PCI-e PHY I/F, and a system controller for controlling the PCI-e PHY I/F and the USB 3.0 PHY I/F. The interface device includes a PIPE I/F bridge in which the PCI-e PHY I/F and the USB 3.0 PHY I/F are provided, and the PIPE I/F bridge selectively switches connection of the PCI-e PHY I/F or the USB 3.0 PHY I/F with the system controller.

Abstract: In the case of mounting two serial communication interfaces such as PCI-e and USB 3.0 with standards different from each other, it is allowed to flexibly address a design change and the like, and reduce a board area. An interface device includes a PCI-e I/F, a USB 3.0 I/F with characteristic impedance and an electric characteristic which are equivalent to those of the PCI-e I/F, and a controller provided with the PCI-e I/F and the USB 3.0 I/F. The interface device is provided with a PHY bus switch for selectively switching between the PCI-e I/F and the USB 3.0 I/F, and in which wiring for connecting the PCI-e I/F and the PHY bus switch and wiring for connecting the USB 3.0 I/F and the PHY bus switch are shared therebetween.

Abstract: An image forming apparatus has a storage unit for storing a job-waiting list in which job information of a job in a waiting state among a plurality of jobs received for image forming is registered, and a transitional time within which to transit from a waiting mode to an energy-saving mode; a waiting list control unit for controlling to register to the job-waiting list the job information of the job instructed to act within a predetermined count period, when a job is being in progress, and controlling to store into the storage unit a time within which to initially register the job information to the job-waiting list; an accumulation-time count unit for, in the case where it is determined that all the job information stored in the job-waiting list has been absent, counting an accumulation time obtained by accumulating an elapsed time, in the predetermined count period, the elapsed time being counted from a time when the job information is registered to the job-waiting list to a time when all the job informatio