at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 673

• Manufacturer Part Number: at91sam9260-cj
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 38-2. USB Host Communication Channels
38.4.2
Figure 38-3. USB Host Drivers
6221G–ATARM–31-Jan-08
Host Controller Driver
Device Enumeration
an Endpoint Descriptor to each endpoint in the system. A queue of Transfer Descriptors is linked
to the Endpoint Descriptor for the specific endpoint.
USB Handling is done through several layers as follows:
• Host controller hardware and serial engine: Transmits and receives USB data on the bus.
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
Host Controller
Communications Area
Interrupt 31
Interrupt 0
Interrupt 1
Interrupt 2
HUB Driver
Done
. . .
. . .
. . .
= Endpoint Descriptor
Class Driver
User Space
Kernel Drivers
Hardware
AT91SAM9260
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