Token Packet, which is initiated by the host and determines if the host will send or receive data.ĭata Packet, where the Data is sent by the transmitter, and a device can return a NAK or Stall packet to indicate if they are not able to respond.
There are four USB packet types including: These fields are used to form data packets, which define the various transactions.
Receiver cannot accept data or the transmitter could not send dataĮndpoint halted or control pipe request is not supported The below table presents the PID Type, the PID Name, and what its purpose is the packet:
Devices that are compliant to both the USB standard’s physical layer (mechanical and electrical) and software layer are approved to use the USB logo, informing consumers and other USB adopters that their cables or devices are safe to use. USB-IF enforces the standards and specifications that USB device manufactures must comply with in order to a be verified as a trusted USB source. The USB architecture was conceptualized with the juncture of companies including Compaq, Digital Equipment, IBM, Intel, Microsoft, and Northern Telecom, and is currently maintained and regulated by the USB Implementors Forum, or USB-IF. With the increase in technological devices during this time, having a universal cable would help reduce the confusion and inconvenience of having a collection of cables needed for each individual device.
The USB protocol, also known as Universal Serial Bus, was first created and introduced in 1996 as a way to institutionalize a more widespread, uniform cable and connector that could be used across a multitude of different devices. USB 3.0 transmission speed 5 Gbit/s = 625 Megabytes per second.An Introduction to the USB Protocol The History of USB.
This is just one of our data transfer unit conversion calculators which can be used to make virtually any kinds of conversions between digital data measurement units. Welcome to our online gigabits per second to megabytes per second conversion calculator.