Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet

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SAM9G25 [DATASHEET]

11032D–ATARM–10-Mar-2014

The USB Host Port controller is fully compliant with the Enhanced HCI specification. The USB Host Port User Interface 
(registers description) can be found in the Enhanced HCI Rev 1.0 Specification available on

. The standard EHCI USB stack driver can be easily ported to Atmel’s 

architecture in the same way all existing class drivers run, without hardware specialization.

The USB Host Port integrates a root hub and transceivers on downstream ports. It provides several Full-speed half-
duplex serial communication ports at a baud rate of 12 Mbit/s. Up to 127 USB devices (printer, camera, mouse, 
keyboard, disk, etc.) and the USB hub can be connected to the USB host in the USB “tiered star” topology.

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 

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.

Other 

Transceivers

DMA

HS USB Host

HS EHCI

 FS OHCI

Other Ports 

PA

1

0

EN_UDPHS

HS

USB

Device

HS 

Transceiver

DMA