Bulk Transfer In Usb In Bexar
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FAQ
USB has four transfer types depending on the data. They are called Control, Bulk, Interrupt, and Isochronous types.
USB devices have two transfer mode types: bulk is used for mass storage devices like an external USB hard drive, and isochronous is used for real-time devices like a USB webcam or capture card.
Maximum packet size of a bulk endpoint depends on the bus speed of the device. For full speed, high speed, and SuperSpeed; the maximum packet sizes are 64, 512, and 1024 bytes respectively.
USB Full speed has a speed of 12 MBit/second = 1,5 MByte/s. But within these 12 MBit also a lot of extra data is transmitted which is not payload, like , endpoint address, CRC5, CRC16, Acknowledge, SOF + EOF packets, etc.. Additionally the bus manager reserves 10% of a frame for Control Transfers.
Bulk Transfers. Bulk Transfers are used for data which are not of the type Control, Interrupt, or Isochronous. Reliable exchange of data is ensured at the hardware level using error detection. Data are transferred in the same manner as in Interrupt Transfers, but have no defined polling rate.
The Universal Serial Bus (USB) specification stipulates five data transfer rates: USB 1.0/Low-Speed: 1.5 Megabits per second (Mbps) USB 1.1/Full-Speed: 12 Mbps. USB 2.0/Hi-Speed: 480 Mbps. USB 3.0/SuperSpeed: 5 Gbps. USB 3.1/SuperSpeed: 10 Gbps.
A USB controller handles all the communication via a USB stack running on a microcontroller (MCU), while a PHY provides the physical interface to the cable.
USB uses a set of unidirectional and bidirectional pipes to transfer user data and control information between the host and USB devices. Each device may support multiple pipes for different purposes, and data transferred in one pipe is independent from data transferred in other pipes.
Control transfer. This type of data transfer is used to configure and control a USB device. The host sends a request to the device and the data transfer follows. Control transfers are also used to check status. Only one control request is handled at any one time.
