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notes/USB.md
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@ -24,5 +24,6 @@ Most bus transactions involve the transmission of up to three packets.
The USB data transfer model between a source or destination on the host and an endpoint on a device is referred to as a *pipe*. There are two types of pipes: stream, and message. Stream data has no USB defined structure, while message data is structured. Each pipe is associated with a bandwidth, transfer service, and endpoint characteristics like directionality and buffer size.
One message pipe, the Default Control Pipe, always exists
One message pipe, the Default Control Pipe, always exists when a USB device is configured in order to provide access to the device's configuration, status, and control info.
For more, see the USB 2.0 specification section 4.4.