Abstract: PRD (Physical Region Descriptor) pre-fetch methods for DMA (Direct Memory Access) unit are provided. When a DMA out transaction for a memory is performed, it is determined whether a first queue is full or nearly full, wherein the first queue is used to store data corresponding to the DMA out transaction. If the first queue is full or nearly full, at least one PRD entry is read from a first PRD table, and stored to a first cache. When a DMA in transaction for the memory is performed, it is determined whether a second queue is empty or nearly empty, wherein the second queue is used to store data corresponding to the DMA in transaction. If the second queue is empty or nearly empty, at least one PRD entry is read from a second PRD table, and stored to a second cache.

Abstract: The present invention provides a method for selecting a network controller and a station device. Supported channel width sets of multiple station STA devices are acquired; a PCP factor of the each STA device is generated according to a supported channel width set and an acquired directional multi-gigabit DMG capability information element of the each STA device, where the PCP factor includes the supported channel width set; a STA device with a largest PCP factor is selected as a PCP. Using the method for selecting a PCP and the STA device provided in the present invention can improve reliability of a wireless local area network WLAN.

Abstract: A method for implementing a decentralized clustering mechanism includes: reserving, by a first wireless device located on a first channel, multiple first scheduled service periods from a first data transfer interval; switching, by the first wireless device, to a second channel within the first scheduled service periods, and transmitting a probe frame over the second channel, where the probe frame includes a cluster probe information element; reserving, by the first wireless device, multiple second scheduled service periods from a second data transfer interval according to timing information in the cluster probe information element; when a response frame from a second wireless device is received within the second scheduled service periods, identifying, by the first wireless device, whether an empty beacon scheduled service period exists; and if exists, transmitting, by the first wireless device, a beacon frame within the empty beacon scheduled service period.

Abstract: Embodiments of the present invention disclose a clustering method, including: adjusting, by a first device, a beginning of its own first small bandwidth beacon transmission interval to be aligned with a selected empty Beacon SP, setting its own BI to be equal to a synchronization device beacon interval S-BI, and joining, after accordingly adjusting an interval VBI for sending a beacon frame on a large bandwidth channel and an interval SBBI for sending a beacon frame on a small bandwidth channel, a target small bandwidth cluster; or sending a beacon frame including a cluster probe IE over a large bandwidth channel, requesting, by using the cluster probe IE, a synchronization PCP to return cluster synchronization information and control information, and joining the target large bandwidth cluster according the information and a second PCP.

Abstract: Provided is a system for interface content transfer and display, comprising: a connection establishment unit for establishing a wireless connection between two terminals which require interface content transfer to be performed; an identification unit for determining the corresponding initial terminal and target terminal in the two terminals; a content acquisition unit for acquiring a display content on a screen interface of the initial terminal; and a transfer and display unit for transferring and displaying the display content on a screen interface of the target terminal. Also proposed are a method for interface content transfer and display and a terminal. The technical solution of the present invention can realize terminal interconnection automatically, and transfer and display a display content of a terminal on another terminal, thereby realizing content transfer and sharing.

Abstract: A system and method for testing gas migration process in the coal and rock mass are disclosed. The method includes the following steps: selecting a cylindrical coal sample, applying an axial pressure and a radial pressure to the coal sample under a sealing state, and/or increasing temperature, to desorb gas absorbed by the coal sample; guiding the gas desorbed from the coal sample by a guiding passage, detecting gas flow rate and pressure, analyzing gas composition and content, and achieving a data statistics. The method provides a theory and data basis for researching the forming and occurring process of gas outburst accident in coal mine. The system is simple and easy to use, and is suitable for migration research of the gas absorbed in the deep coal-rock mass.

Abstract: A system and method for testing gas migration process in the coal and rock mass are disclosed. The method includes the following steps: selecting a cylindrical coal sample, applying an axial pressure and a radial pressure to the coal sample under a sealing state, and/or increasing temperature, to desorb gas absorbed by the coal sample; guiding the gas desorbed from the coal sample by a guiding passage, detecting gas flow rate and pressure, analyzing gas composition and content, and achieving a data statistics. The method provides a theory and data basis for researching the forming and occurring process of gas outburst accident in coal mine. The system is simple and easy to use, and is suitable for migration research of the gas absorbed in the deep coal-rock mass.

Abstract: The present invention provides a USB host controller and control method thereof. The USB host controller comprises a first controller, a second controller and a first memory. The first controller controls first transfer between a host and a USB device. The second controller controls second transfer between the host and the USB device. The first memory is coupled to the first controller and the second controller and is configured to temporarily store data transferred between the host and the USB device. The first controller accesses the first memory during the first transfer, and the second controller accesses the first memory during the second transfer.

Abstract: Data transmission systems and methods. The data transmission system comprises a bus, a slave, a master, and a master interface. The master transmits a request comprising transfer information comprising a start address and a length. The master interface receives the request from the master. The master interface determines a burst type of a first burst according to the transfer information, and transmits the first burst with the burst type to the slave via the bus, where the first burst is aligned to at least one address boundary of the slave. The master interface receives data corresponding to the first burst from the slave, and transmits the data to the master.

Abstract: An optical fiber end structure includes an optical fiber having a core end portion and a coating portion extending therefrom, and a glass capillary having a pore. The core end portion of the optical fiber is extended within the pore of the glass capillary. An outer surface of the core end portion of the optical fiber is heat-melted with an inner surface of the pore of the glass capillary to form a transitional layer therebetween such that the core end portion of the optical fiber is coaxially aligned along the axis of the glass capillary. Therefore, it significantly reduces the deviation distance between the core end portion of the optical fiber and the pore of the glass capillary. It not only increases the glass capillary stability and reliability, lower the manufacturing cost, but also improves manufacturing quality and its precision.

Abstract: The present invention provides a USB host controller and control method thereof. The USB host controller comprises a first controller, a second controller and a first memory. The first controller controls first transfer between a host and a USB device. The second controller controls second transfer between the host and the USB device. The first memory is coupled to the first controller and the second controller and is configured to temporarily store data transferred between the host and the USB device. The first controller accesses the first memory during the first transfer, and the second controller accesses the first memory during the second transfer.

Abstract: A glitch-free clock switching circuit receives a first clock signal and a second clock signal and outputs a third clock signal corresponding to the first clock signal or a fourth clock signal corresponding to the second clock signal according to a clock switching signal. The glitch-free clock switching circuit switches to output clock signals by stopping output of a clock signal, and then waiting for a predetermined period of time before outputting another clock signal.

Abstract: PRD (Physical Region Descriptor) pre-fetch methods for DMA (Direct Memory Access) unit are provided. When a DMA out transaction for a memory is performed, it is determined whether a first queue is full or nearly full, wherein the first queue is used to store data corresponding to the DMA out transaction. If the first queue is full or nearly full, at least one PRD entry is read from a first PRD table, and stored to a first cache. When a DMA in transaction for the memory is performed, it is determined whether a second queue is empty or nearly empty, wherein the second queue is used to store data corresponding to the DMA in transaction. If the second queue is empty or nearly empty, at least one PRD entry is read from a second PRD table, and stored to a second cache.

Abstract: A glitch-free clock switching circuit receives a first clock signal and a second clock signal and outputs a third clock signal corresponding to the first clock signal or a fourth clock signal corresponding to the second clock signal according to a clock switching signal. The glitch-free clock switching circuit switches to output clock signals by stopping output of a clock signal, and then waiting for a predetermined period of time before outputting another clock signal.

Abstract: Data transmission systems and methods. The data transmission system comprises a bus, a slave, a master, and a master interface. The master transmits a request comprising transfer information comprising a start address and a length. The master interface receives the request from the master. The master interface determines a burst type of a first burst according to the transfer information, and transmits the first burst with the burst type to the slave via the bus, where the first burst is aligned to at least one address boundary of the slave. The master interface receives data corresponding to the first burst from the slave, and transmits the data to the master.