Datasheet

581
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
35. USB Host Port (UHP)
35.1 Overview
The USB Host Port (UHP) interfaces the USB with the host application. It handles Open HCI protocol (Open Host
Controller Interface) as well as USB v2.0 Full-speed and Low-speed protocols.
The USB Host Port integrates a root hub and transceivers on downstream ports. It provides several high-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 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 application. As an
example, integrating an HID (Human Interface Device) class driver provides a plug & play feature for all USB
keyboards and mouses.
35.2 Embedded Characteristics
 Compliance with Open HCI Rev 1.0 specification
 Compliance with USB V2.0 Full-speed and Low-speed Specification
 Supports both Low-speed 1.5 Mbit/s and Full-speed 12 Mbit/s USB devices
 Root hub integrated with two downstream USB ports
 Two embedded USB transceivers
 No overcurrent detection
 Supports power management
 Operates as a master on the Bus Matrix