Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
560
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
34.5.2 Host
Controller
Driver
Figure 34-3. 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.
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.
driver.
34.6
Typical Connection
Figure 34-4. Board Schematic to Interface UHP Device Controller
A termination serial resistor must be connected to HDP and HDM. The resistor value is defined in the electrical
specification of the product (R
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
10nF
100nF
10
μ
F
5V
0.20A
Type A Connector
R
EXT
R
EXT
HDMA
or
HDMB
HDPA
or
HDPB
10nF
100nF
10
μ
F
5V
0.20A
Type A Connector
R
EXT