vault backup: 2025-08-03 13:36:47
This commit is contained in:
15
notes/USB.md
Normal file
15
notes/USB.md
Normal file
@ -0,0 +1,15 @@
|
||||
A USB system is composed of three areas:
|
||||
- USB interconnect (cables, ports)
|
||||
- USB devices (keyboard, storage, controller)
|
||||
- USB host (Laptop, computer)
|
||||
|
||||
# Hosts
|
||||
There is only one host in any USB system. The USB interface to the host computer is referred to as the Host Controller. The Host Controller may be implemented in a combination of hardware, firmware, or software. A root hub is integrated within the host system to provide one or more attachment points.
|
||||
# Devices
|
||||
USB devices are one of the following:
|
||||
- A hub, providing additional attachment points to the bus
|
||||
- Functions that provide capabilities to the system (speakers, keyboard)
|
||||
# Interconnects
|
||||
|
||||
# Protocol
|
||||
A Universal Serial bus is strictly a *polled* bus, meaning the
|
Reference in New Issue
Block a user