Canon Kabushiki Kaisha

Anne Abiven

Alain Caillerie

Claude Le Dantec

Pascal Rousseau

Bernard Revillet

Jean-Paul Accarie

Vicente Sanchez-Leighton

Sylvain Joyeau

The invention concerns the sharing and the controlling of access to at least one peripheral for a computer system which includes a central processing unit and at the least one peripheral which has a physical interface to the central processing unit. Specifically, a request for access is received at an address of a virtual interface, where the address of the virtual interface corresponds to the physical interface, and data is exchanged between the central processing unit and the at least one peripheral is received. The received data is modified according to at least one predetermined criterion corresponding to the address of the virtual interface.

Device and method for controlling access to computer peripherals

The invention concerns a data packet switching unit () associated with a node () in a network () and having several input/output ports for the packets. The unit is wherein it has:

Unit and method for switching data packets, a data processing apparatus comprising such a unit and a network comprising them

For coding and decoding data, the data to be coded and the decoded data being stored in a memory ( ), a single data coding and decoding means ( ) is used. The coding and decoding means is initialised in coding mode, and the passage of data to be coded from the memory ( ) to the coding and decoding means ( ) is controlled, or the coding and decoding means is initialised in decoding mode, and the input of coded data into the coding and decoding means ( ) and the passage of decoded data from the coding and decoding means to the memory ( ) are controlled.

Device and method for coding and decoding data

A device for communication, between at least two asynchronous computer buses, having at least one intermediate storage unit adapted to be accessed in read and/or write mode at least two different frequencies. Each computer bus includes an adapter for interfacing between the computer bus and a memory. Each adapter has an adapter memory and two bidirectional ports, one of the bidirectional ports being connected to the computer bus and the other bidirectional port being connected to the storage unit. Each intermediate storage unit can be accessed in write and/or read mode by each of the computer buses and the interface adapter which is associated with the computer bus.

Device and method for communication between asynchronous computer buses using an adapter

The methods for transmission of sequences or frames of data provide for retransmitting, with a central device (21), frames of data which reach it, to destination devices, by transmission of downlink frames when the destination device is a peripheral device (24), each downlink frame having systematically a service message activating a protocol controlling access to the transmission medium shared by the central device (21) and the peripheral devices (24), and possibly a frame of data. The central device (21) and at least one peripheral device (24) form a system which is particularly well suited to a local area network, notably with a wireless transmission medium.

Methods, devices and system for transmission of digital data

A digital communication converter includes: a connection unit with a communication unit from which it receives or to which it delivers data frames; and a unit for sending/receiving over a transmission medium in order to transmit, by means of the medium, data frames which are delivered to it and/or to deliver information frames which it receives by means of the medium. A transmission control unit delivers, respectively to the connection unit and the sending/receiving unit, frames which have been delivered to it respectively by the sending/receiving unit and by means of the connection unit. A memory stores an address relating to the communication unit, this address being used for operating a protocol for controlling access to the transmission medium.

Growing community of inventors

Cesson Sevigne, France

Anne Abiven