Abstract: A communication apparatus for carrying out communications to and from an external apparatus that includes a first interconnecting unit and a first non-transparent port and effects an interconnection for communications via the first non-transparent port is provided. The communication apparatus includes a second interconnecting unit that includes a second non-transparent port communicably connected to the first non-transparent port. The second interconnecting unit effects an interconnection for communications via the second non-transparent port. The second interconnecting unit performs, when the communication apparatus carries out communications to and from the external apparatus, address translation between an address for use by the communication apparatus and an address for use by the second non-transparent port.

Abstract: A communication device includes a signal correcting unit that performs signal correction on an electric signal indicating information to be transmitted to reduce signal deterioration occurring in transmission of the electric signal; a conversion unit that converts the electric signal subjected to the signal correction into a digital signal on which information indicating the signal correction performed by the signal correcting unit is superimposed; and a light-emitting element that emits light in accordance with the digital signal converted by the conversion unit.

Abstract: A memory control apparatus that controls writing and reading of data to/from a memory. The memory control apparatus includes: a sequence control unit that receives a packet sequence including a write packet including a write request of data and a read packet including a read request of the data, and changes an arrangement of the write packet and the read packet included in the packet sequence so that a first predetermined number of write packets are arranged successively and a second predetermined number of read packets are arranged successively; and a command output unit that receives the packet sequence from the sequence control unit, and outputs a write command according to the write packet and an a read command according to the read packet to the memory, in accordance with an order of arrangement of the write packet and the read packet.

Abstract: A communication apparatus for carrying out communications to and from an external apparatus that includes a first interconnecting unit and a first non-transparent port and effects an interconnection for communications via the first non-transparent port is provided. The communication apparatus includes a second interconnecting unit that includes a second non-transparent port communicably connected to the first non-transparent port. The second interconnecting unit effects an interconnection for communications via the second non-transparent port. The second interconnecting unit performs, when the communication apparatus carries out communications to and from the external apparatus, address translation between an address for use by the communication apparatus and an address for use by the second non-transparent port.

Abstract: A communication apparatus for carrying out communications to and from an external apparatus that includes a first interconnecting unit and a first non-transparent port and effects an interconnection for communications via the first non-transparent port is provided. The communication apparatus includes a second interconnecting unit that includes a second non-transparent port communicably connected to the first non-transparent port. The second interconnecting unit effects an interconnection for communications via the second non-transparent port. The second interconnecting unit performs, when the communication apparatus carries out communications to and from the external apparatus, address translation between an address for use by the communication apparatus and an address for use by the second non-transparent port.

Abstract: An image forming apparatus receives raster image data transferred from an external device and forms an image on the basis of the received raster image data. The apparatus includes a processor that controls a transfer of the raster image data from the external device, a first memory connected to the processor through a first bus is used as a working area of the processor, a second memory that stores the raster image data, a memory control unit connected to the second memory through a second bus controls an operation of writing and reading the raster image data in and from the second memory, a printer engine that forms an image on the basis of the raster image data, and an engine control unit that reads the raster image data from the second memory through the memory control unit and supplies the printer engine with the read raster image data.

Abstract: A communication device includes a signal correcting unit that performs signal correction on an electric signal indicating information to be transmitted to reduce signal deterioration occurring in transmission of the electric signal; a conversion unit that converts the electric signal subjected to the signal correction into a digital signal on which information indicating the signal correction performed by the signal correcting unit is superimposed; and a light-emitting element that emits light in accordance with the digital signal converted by the conversion unit.

Abstract: A memory control apparatus that controls writing and reading of data to/from a memory. The memory control apparatus includes: a sequence control unit that receives a packet sequence including a write packet including a write request of data and a read packet including a read request of the data, and changes an arrangement of the write packet and the read packet included in the packet sequence so that a first predetermined number of write packets are arranged successively and a second predetermined number of read packets are arranged successively; and a command output unit that receives the packet sequence from the sequence control unit, and outputs a write command according to the write packet and an a read command according to the read packet to the memory, in accordance with an order of arrangement of the write packet and the read packet.

Abstract: An image forming apparatus receives raster image data transferred from an external device and forms an image on the basis of the received raster image data. The apparatus includes a processor that controls a transfer of the raster image data from the external device, a first memory connected to the processor through a first bus is used as a working area of the processor, a second memory that stores the raster image data, a memory control unit connected to the second memory through a second bus controls an operation of writing and reading the raster image data in and from the second memory, a printer engine that forms an image on the basis of the raster image data, and an engine control unit that reads the raster image data from the second memory through the memory control unit and supplies the printer engine with the read raster image data.

Abstract: A communication apparatus for carrying out communications to and from an external apparatus that includes a first interconnecting unit and a first non-transparent port and effects an interconnection for communications via the first non-transparent port is provided. The communication apparatus includes a second interconnecting unit that includes a second non-transparent port communicably connected to the first non-transparent port. The second interconnecting unit effects an interconnection for communications via the second non-transparent port. The second interconnecting unit performs, when the communication apparatus carries out communications to and from the external apparatus, address translation between an address for use by the communication apparatus and an address for use by the second non-transparent port.

Abstract: An image forming apparatus includes an image input device that reads an image to obtain image data and a printer engine that forms an image on a medium based on image data. A bus of a PCI Express standard is used to transfer data. Storage areas serving as end points of the standard and hardware resources that transmit data and receive image data to and from the storage areas are connected to an identical switch according to the PCI Express standard. Specifically, an input/output area, an image input device, and a printer engine are connected to one switch, and a storage area, a compressor, and a hard disk is connected to another switch.

Abstract: An information processor that is connected to at least one other information processor via a network, includes a detecting unit that detects an optional device to be used for information processing, as a target optional device, installed on the other information processor, an issuing unit that issues an access request to use the target optional device to the other information processor, a receiving unit that receives an access permission for access to the target optional device from the other information processor, and a processing unit that performs the information processing with the target optional device.

Abstract: A high-speed serial switch fabric is configured to perform a mapping of a traffic class that is capable of differentiating traffics onto a virtual channel. The high-speed serial switch fabric connects a plurality of devices. A traffic-class setting unit sets, when a conflict occurs between devices connected to the high-speed serial switch fabric, the traffic class for each of traffics in the devices having the conflict. A channel setting unit assigns each of set traffic classes to different virtual channels, and gives a priority of data communication to each of the set traffic classes.

Abstract: A high-speed serial switch fabric is configured to perform a mapping of a traffic class that is capable of differentiating traffics onto a virtual channel. The high-speed serial switch fabric connects a plurality of devices. A traffic-class setting unit sets, when a conflict occurs between devices connected to the high-speed serial switch fabric, the traffic class for each of traffics in the devices having the conflict. A channel setting unit assigns each of set traffic classes to different virtual channels, and gives a priority of data communication to each of the set traffic classes.

Abstract: An information processor that is connected to at least one other information processor via a network, includes a detecting unit that detects an optional device to be used for information processing, as a target optional device, installed on the other information processor, an issuing unit that issues an access request to use the target optional device to the other information processor, a receiving unit that receives an access permission for access to the target optional device from the other information processor, and a processing unit that performs the information processing with the target optional device.

Abstract: An image forming apparatus includes an image input device that reads an image to obtain image data and a printer engine that forms an image on a medium based on image data. A bus of a PCI Express standard is used to transfer data. Storage areas serving as end points of the standard and hardware resources that transmit data and receive image data to and from the storage areas are connected to an identical switch according to the PCI Express standard. Specifically, an input/output area, an image input device, and a printer engine are connected to one switch, and a storage area, a compressor, and a hard disk is connected to another switch.

Abstract: A data transfer system using a high-speed serial interface system that forms a tree structure in which point-to-point communication channels are established for data sending and data receiving independently is provided. The data transfer system includes plural end points each having plural upper ports each of which is connected to a switch of an upper side, wherein each end point includes a port selecting part for selecting a port to be used according to an operation mode of the data transfer system so as to dynamically change the tree structure.

Abstract: An image forming system comprising a serial communication control part, an image input part, an image output part, an image processing part, a storage part, a printer controller, and a high-speed serial bus. The high-speed serial bus mutually couples the serial communication control part and at least one of the image input part, the image output part, the image processing part, the storage part and the printer controller.

Abstract: An imaging system that implements a PCI Express high-speed serial interface system is disclosed in which a plurality of point-to-point simplex communication channels are established to realize a data communication network having a tree structure. The imaging system includes a PCI Express high-speed serial interface, and plural independent image processing units as end point devices of the tree structure that are connected by the PCI Express high-speed serial interface.