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USB Cabletransfer Data

Estar Industrial Group Co.,Ltd | Updated: Aug 17, 2017

USBCable, which is referred to as a serial cable, is a serial bus standard for connecting computer systems and external devices. It is also a technical specification for input and output interfaces. It is widely used in information communication products such as personal computers and mobile devices. To photographic equipment, digital TV (set-top boxes), game consoles and other related fields. USB at the end of 1994 by Intel, Compaq, IBM, Microsoft and other companies jointly proposed. The USB interface supports plug-and-play and hot-swapping of devices.

The main controller is responsible for the transmission of data streams between the host and the USB device. These transmission data are treated as consecutive bit streams. Each device provides one or more interfaces that can communicate with the client program, each consisting of 0 or more pipes that independently transmit data between the client program and the specific terminal of the device. USBD establishes the interface and the pipeline for the actual needs of the host software. When the configuration request is made, the main controller provides the service according to the parameters provided by the host software.

USBCable supports four basic data transfer modes: control transmission, isochronous transmission, interrupt transmission and data block transfer. Each transmission mode is applied to a terminal with the same name, and has different properties.

The control transmission type supports the transmission of control, status, configuration and other information between the peripheral and the host, and provides a control channel between the peripheral and the host. Each peripheral supports control of the transmission type, so that between the host and the peripherals can send configuration and command / status information.

The isochronous (lsochronous) transmission type (or synchronous transmission) supports data transmission between peripherals and hosts with periodic, limited latency and bandwidth and constant data transfer rates. This type of error-free verification, it can not guarantee the correct data transmission, support like computer - telephone integrated system (CTI) and audio system and host data transmission.

The interrupt transmission type supports input devices such as game handles, mouse and keyboard, and these devices are small in size and no cycle, but are responsive to response time and are required to respond immediately.

Block (Bulk) transmission type support printers, scanners, digital cameras and other peripherals, these peripherals and host data transmission between the large, USB bandwidth to meet the case of the type of data transmission.

USBCable uses a split bandwidth allocation scheme that can not enter the device if the peripherals exceed the current bandwidth allocation or potential requirements. Synchronize and interrupt the transmission type of the terminal to retain the bandwidth and ensure that the data is transmitted at a certain rate. The centralized and control terminals transmit the transmission data according to the best available bandwidth.

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