Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
822
The USB Host Port controller is fully compliant with the Open HCI specification. The USB Host Port User Interface
(registers description) can be found in the Open HCI Rev 1.0 Specification available on www.hp.com. The
standard OHCI USB stack driver can be easily ported to Atmel’s architecture, in the same way all existing class
drivers run without hardware specialization.
This means that all standard class devices are automatically detected and available to the user’s application. As
an example, integrating an HID (Human Interface Device) class driver provides a plug & play feature for all USB
keyboards and mouses.
36.3 Block Diagram
Figure 36-2. Block Diagram
Access to the USB host operational registers is achieved through the AHB bus slave interface. The Open HCI host
controller and Enhanced HCI host controller initialize master DMA transfers through the AHB bus master interface
as follows:
 Fetches endpoint descriptors and transfer descriptors
 Access to endpoint data from system memory
 Access to the HC communication area
 Write status and retire transfer descriptor
Memory access errors (abort, misalignment) lead to an “Unrecoverable Error” indicated by the corresponding flag
in the host controller operational registers.
PORT S/M 1
PORT S/M 0
USB transceiver
HHSDPA
HHSDMA
Embedded USB
v2.0 High-speed Transceiver
Root Hub
and
Host SIE
List Processor
Block
FIFO 64 x 8
HCI
Slave Block
OHCI
Registers
Root
Hub Registers
AHB
ED & TD
Regsisters
Control
HCI
Master Block
Data
AHB
Slave
Master
HFSDPA
HFSDMA
USB transceiver
HHSDPB
HHSDMB
HFSDPB
HFSDMB
AHB
AHB
Slave
Master
HCI
Slave Block
EHCI
Registers
HCI
Master Block
List
Processor
Packet
Buffer
FIFO
SOF
generator
Control
Data