at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 825

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

41.4.2
6249D–ATARM–20-Dec-07
Host Controller Driver
an Endpoint Descriptor to each endpoint in the system. A queue of Transfer Descriptors is linked
to the Endpoint Descriptor for the specific endpoint.
Figure 41-2. USB Host Communication Channels
Figure 41-3. USB Host Drivers
USB Handling is done through several layers as follows:
Device Enumeration
Open HCI
= Transfer Descriptor
Device Register
in Memory Space
Operational
Registers
Mini Driver
Mode
HCCA
Status
Event
Frame Int
Ratio
Control
Bulk
Host Controller Hardware
USB Driver
Host Controller Driver
User Application
Class Driver
Shared RAM
AT91SAM9263 Preliminary
Host Controller
Communications Area
Interrupt 31
Interrupt 0
Interrupt 1
Interrupt 2
HUB Driver
Done
. . .
. . .
. . .
= Endpoint Descriptor
Class Driver
User Space
Kernel Drivers
Hardware
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