What does URB mean in UNCLASSIFIED
There are several types of URBs, each designed for specific I/O operations:
URB meaning in Unclassified in Miscellaneous
URB mostly used in an acronym Unclassified in Category Miscellaneous that means USB Request Blocks
Shorthand: URB,
Full Form: USB Request Blocks
For more information of "USB Request Blocks", see the section below.
URB Components
- Header: Contains essential information about the URB, such as its length, type, and status.
- Function: Specifies the specific I/O operation to be performed, such as a data read, write, or setup.
- Buffer: Points to the memory location where the data to be transferred is stored or retrieved.
- Length: Indicates the size of the data to be transferred.
- Endpoint: Identifies the USB endpoint on the device that is involved in the operation.
- Interval: For isochronous transfers, specifies the frequency at which data packets are scheduled.
- Error: Contains information about any errors encountered during the operation.
Types of URBs
- Control URBs: Used for device configuration, status retrieval, and vendor-specific operations.
- Bulk URBs: Optimized for large data transfers and support error correction.
- Interrupt URBs: Intended for real-time data transfers, such as mouse or keyboard input.
- Isochronous URBs: Designed for applications requiring guaranteed data delivery at specific time intervals, such as audio or video streaming.
Benefits of URBs
- Standardization: Provides a common interface for different USB devices and host controllers.
- Efficiency: Enables efficient data transfers by optimizing resource utilization and minimizing overhead.
- Reliability: Supports error handling and recovery mechanisms to ensure data integrity.
- Flexibility: Allows for customization and extension to support various I/O operations.
Essential Questions and Answers on USB Request Blocks in "MISCELLANEOUS»UNFILED"
What are USB Request Blocks (URBs)?
URBs are data structures used by USB drivers to represent data transfer requests. They contain information about the data to be transferred, the destination or source endpoint, and other parameters necessary for the USB controller to process the request.
What are the different types of URBs?
There are several types of URBs, including Bulk URBs for large data transfers, Interrupt URBs for time-critical data, Isochronous URBs for real-time data streaming, and Control URBs for device configuration and status requests.
How are URBs used in USB data transfer?
URBs are submitted to the USB controller by the USB driver. The controller then processes the URB and transfers the data to or from the USB device. Once the transfer is complete, the controller returns the URB to the driver with status information.
What is the purpose of a USB Request Queue?
A USB Request Queue is a data structure that stores URBs waiting to be processed by the USB controller. It allows the driver to queue multiple data transfer requests and optimize the use of the USB bandwidth.
What causes URB errors?
URB errors can occur due to various reasons, such as invalid URB parameters, hardware errors, or device malfunctions. The error code returned with the URB indicates the specific cause of the error.
Final Words: USB Request Blocks (URBs) are essential components in the USB architecture, facilitating the transfer of data between host computers and USB devices. By defining the parameters and behavior of I/O operations, URBs provide a standardized and efficient way to manage data communication, ensuring reliable and efficient data transfers.
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