Author: lwhsu Date: Thu Sep 10 04:17:23 2020 New Revision: 365552 URL: https://svnweb.freebsd.org/changeset/base/365552
Log: MFC r365403: Slightly improve usb(4) - Mention USB 3.0 - Update links - Fix `mandoc -T lint` warnings Reviewed by: bcr, hselasky Differential Revision: https://reviews.freebsd.org/D26349 Modified: stable/11/share/man/man4/usb.4 Directory Properties: stable/11/ (props changed) Modified: stable/11/share/man/man4/usb.4 ============================================================================== --- stable/11/share/man/man4/usb.4 Thu Sep 10 04:17:05 2020 (r365551) +++ stable/11/share/man/man4/usb.4 Thu Sep 10 04:17:23 2020 (r365552) @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd April 29, 2017 +.Dd September 7, 2020 .Dt USB 4 .Os .Sh NAME @@ -52,8 +52,7 @@ for more information. .Sh DESCRIPTION .Fx provides machine-independent bus support and drivers for -.Tn USB -devices in host and device side mode. +USB devices in host and device side mode. .Pp The .Nm @@ -67,32 +66,25 @@ driver has three layers: The controller attaches to a physical bus like .Xr pci 4 . -The -.Tn USB -bus attaches to the controller, and the root hub attaches +The USB bus attaches to the controller, and the root hub attaches to the controller. Any devices attached to the bus will attach to the root hub -or another hub attached to the -.Tn USB -bus. +or another hub attached to the USB bus. .Pp The .Nm uhub device will always be present as it is needed for the root hub. .Sh INTRODUCTION TO USB -The -.Tn USB -is a system where external devices can be connected to a PC. +The USB is a system where external devices can be connected to a PC. The most common USB speeds are: .Bl -tag -width 6n -offset indent -.It Low Speed (1.5MBit/sec) -.It Full Speed (12MBit/sec) -.It High Speed (480MBit/sec) +.It Low Speed (1.5 MBit/sec) +.It Full Speed (12 MBit/sec) +.It High Speed (480 MBit/sec) +.It SuperSpeed (5 GBit/sec) .El .Pp -Each -.Tn USB -has a USB controller that is the master of the bus. +Each USB has a USB controller that is the master of the bus. The physical communication is simplex which means the host controller only communicates with one USB device at a time. .Pp @@ -122,9 +114,7 @@ A device may operate in different configurations. Depending on the configuration, the device may present different sets of endpoints and interfaces. .Pp -The bus enumeration of the -.Tn USB -bus proceeds in several steps: +The bus enumeration of the USB bus proceeds in several steps: .Bl -enum .It Any interface specific driver can attach to the device. @@ -132,11 +122,9 @@ Any interface specific driver can attach to the device If none is found, generic interface class drivers can attach. .El .Sh SEE ALSO -The -.Tn USB -specifications can be found at: +The USB specifications can be found at: .Pp -.D1 Pa http://www.usb.org/developers/docs/ +.D1 Pa https://www.usb.org/documents .Pp .Xr libusb 3 , .Xr aue 4 , @@ -166,7 +154,7 @@ specifications can be found at: .Sh STANDARDS The .Nm -module complies with the USB 2.0 standard. +module complies with the USB 3.0 standard. .Sh HISTORY The .Nm _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
