Datasheet

585
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
35.5.2 Host Controller Driver
Figure 35-3. USB Host Drivers
USB Handling is done through several layers as follows:
 Host controller hardware and serial engine: Transmits and receives USB data on the bus.
 Host controller driver: Drives the Host controller hardware and handles the USB protocol.
 USB Bus driver and hub driver: Handles USB commands and enumeration. Offers a hardware independent
interface.
 Mini driver: Handles device specific commands.
 Class driver: Handles standard devices. This acts as a generic driver for a class of devices, for example the
HID driver.
35.6 Typical Connection
Figure 35-4. Board Schematic to Interface UHP Device Controller
As device connection is automatically detected by the USB host port logic, a pull-down must be connected on DP
and DM on the board. Otherwise the USB host permanently detects a device connection on this port.
A termination serial resistor must be connected to HDP and HDM. The resistor value is defined in the electrical
specification of the product (R
EXT
).
Host Controller Hardware
HUB Driver
Host Controller Driver
USB Driver
Mini Driver
Class Driver Class Driver
User Application
Kernel Drivers
User Space
Hardware
R
EXT
HDMA
or
HDMB
HDPA
or
HDPB
15kΩ15kΩ
10nF
100nF10μF
5V
0.20A
Type A Connector
R
EXT