Samsung Electronics Co., Ltd.

Cheon-Su Lee

Young-Sik Kim

Rohitaswa Bhattacharya

Soon-jae Won

A universal serial bus (USB) communication system includes a USB host that divides one data stream into first through (n)th sub-data streams and transmits the first through (n)th sub-data streams via first through (n)th USB host channels, respectively, a USB device that receives the first through (n)th sub-data streams via first through (n)th USB device channels, respectively and restores the data stream by combining the first through (n)th sub-data streams, and first through (n)th cables that are connected to the first through (n)th USB host channels via first through (n)th USB host ports and connected to the first through (n)th USB device channels via first through (n)th USB device ports. Here, the first through (n)th cables connect the first through (n)th USB host channels to the first through (n)th USB device channels, respectively.

Universal serial bus communications system

A method of arbitrating a system bus shared by a CPU, which is a first master device, and second and third master devices comprises storing a first bus occupancy rate for each master device and a variable bus occupancy rate. When an interrupt signal provided to the CPU is activated, a second rate for the CPU, which is a sum of the first rate for the CPU and the variable rate, and the first rates for the second and third master devices are applied to a bus arbiter. When the interrupt signal is inactivated, a third rate for the CPU, which is obtained by subtracting the variable rate from the first rate for the CPU, and the first rates for the second and third master devices are applied to the bus arbiter. A use priority of the system bus is controlled according to the rates applied to the bus arbiter.

Dynamic bus arbitration method and bus arbiter

A semiconductor device for initializing an interface card using a serial EEPROM and an initializing method allow for more effective use of a serial EEPROM used to store the initialization information, while not consuming additional circuit surface area. The method comprises initializing a semiconductor device, wherein the semiconductor device stores initialization information in a serial electrically erasable and programmable read only memory (EEPROM) and includes a direct memory access (DMA), a serial EEPROM interface, and a register interface that are connected to a common system bus according to the initialization information, the method comprising (a) setting an operational channel to allow the DMA automatically initialize the semiconductor device in a state where the semiconductor device is reset; (b) reading the initialization information from the serial EEPROM in response to the operational channel set in the DMA after the reset state of the semiconductor device is cancelled; (c) initializing the semiconductor device by writing the initialization information read out from the serial EEPROM to the register interface; (d) generating an initialization completion signal for indicating that the initialization of the semiconductor device is completed, and (e) automatically setting the register interface and the DMA to be prepared for normal operations after the initialization of the semiconductor device is completed.

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Yongin, South Korea

Cheon-Su Lee