From 593b44d260ea552b337a4dae848533cbbd143e62 Mon Sep 17 00:00:00 2001 From: arc Date: Sun, 3 Aug 2025 13:51:48 -0600 Subject: [PATCH] vault backup: 2025-08-03 13:51:48 --- notes/USB.md | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/notes/USB.md b/notes/USB.md index 2f7390f..ae9c6ba 100644 --- a/notes/USB.md +++ b/notes/USB.md @@ -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.